500 Most commons


  1. Most common aortic branch involved in Takayasu arteritis : Left subclavian
  2. Most common cause of respiratory distress in newborn : Transient tachypnea of the newborn
  3. Most common location to see Asbestosis sequale : Posterior lower lobes.
  4. Most common karyotype / chromosomal abnormality in USA : Down’s syndrome
  5. Most common osseous lymphoma, primary and secondary : Diffuse large B-cell lymphoma
  6. Most common primary malignant orbital tumor in childhood : Rhabdomyosarcoma
  7. Most common type of fluid collection in scrotum : Hydrocele
  8. Most common type of liposarcoma to affect children : Myxoid liposarcoma
  9. Most common abdominal emergency of early childhood : Intussusception.
  10. Most common acetabular fracture : Posterior acetabulum.
  11. Most common affected bowel segment in TB : Ileocecal area.
  12. Most common affected joint in gout : First MTP.
  13. Most common AIDS-related neoplasm : Kaposi Sarcoma
  14. Most common allergic aspergillosis syndrome : Allergic bronchopulmonary aspergillosis.
  15. Most common anatomic variant of pancreas : Pancreas divisum
  16. Most common anomalous course of RCA : Interarterial
  17. Most common appearance of Legionella at the peak of the disease : Bilateral airspace consolidation.
  18. Most common assoc. w/ Fx of great toe distal phalanx with physeal involvement :Osteomyelitis.
  19. Most common associated anomaly with coarctation : Bicuspid valve.
  20. Most common association of PAPVR : Sinus venosus type ASD.
  21. Most common association with small left colon syndrome : Maternal DM
  22. Most common bacterial cause of mesenteric adenitis : Yersinia enterocolitica.
  23. Most common benign cardiac rhythm abnormality : PAC
  24. Most common benign cartilage-containing tumor : Osteochondroma
  25. Most common benign growth of the skeleton : Osteochondroma
  26. Most common benign hepatic lesion : Hemangioma
  27. Most common benign hepatic tumor during fist 6 mo. of life : Infantile Hemangioendothelioma
  28. Most common benign intraconal tumor of the orbit in adults : Cavernous hemangiomas.
  29. Most common benign masses caused by asbestos exposure : Atelectatic Asbestos Pseudotumor
  30. Most common benign mesenchymal tumor of kidney : AML
  31. Most common benign mucosal tumor of the esophagus : Papilloma
  32. Most common benign nasopharyngeal tumor : Juvenile angiofibroma.
  33. Most common benign orbital tumor in childhood : Dermoid Cyst of Orbit
  34. Most common benign ovarian neoplasm in young and middle-aged women (<45 years) :Mature teratoma
  35. Most common benign radiation-induced tumor of the musculoskeletal system : Osteochondroma
  36. Most common benign rib lesion in an adult : Fibrous dysplasia.
  37. Most common benign soft-tissue tumor of the foot : Plantar fibromatosis
  38. Most common benign soft-tissue tumor of vascular origin : Hemangioma
  39. Most common benign solid tumor in women of childbearing age : Fibroadenoma
  40. Most common benign testicular mass : Simple cyst
  41. Most common benign tumor of spleen : Hemangioma
  42. Most common benign tumor of the larynx : Squamous papilloma
  43. Most common benign tumor of the lung : Hamartoma
  44. Most common benign tumor of the small bowel : GIST
  45. Most common benign vascular gastric tumor : Glomus tumor of stomach.
  46. Most common bilateral testicular tumor : Lymphoma
  47. Most common biliary complication s/p lap. cholecystectomy : Bile duct leak from cystic duct stump.
  48. Most common biliary complication s/p liver transplantation : Obstruction/stenosis at anastomosis.
  49. Most common bladder neoplasm in children younger than 10 years : Rhabdomyosarcoma
  50. Most common bone to develop an osteochondroma : Femur (tibia second most common)
  51. Most common brain anomaly on prenatal sonograms : Isolated Mild Ventriculomegaly
  52. Most common breast tumor under age 25 years : Fibroadenoma
  53. Most common cardiac manifestation of Systemic Lupus Erythematous : Pericarditis
  54. Most common cardiac tumor in children : Rhabdomyoma.
  55. Most common cardiac valvular tumor : Papillary fibroelastoma
  56. Most common carpal dislocation : Transscaphoid perilunate dislocation.
  57. Most common causative organism of acute pyogenic meningitis in adults : Strep. pneumoniae
  58. Most common causative organism of neonatal pyogenic meningitis : E. coli
  59. Most common cause for failure of dialysis graft : Fibrointimal hyperplasia : venous outflow stenosis.
  60. Most common cause for late failure in lung transplant patient : Bronchiolitis obliterans
  61. Most common cause for pulmonary edema : Left-sided heart disease
  62. Most common cause non iatrogenic cause of small bowel obstruction : Hernia
  63. Most common cause of a large choroid plexus cyst : Trisomy 18.
  64. Most common cause of a large pleural fluid collection in the newborn period : Chylothorax
  65. Most common cause of acute renal failure in children requiring dialysis : HUS
  66. Most common cause of acute testicular pain in postpubertal male : Acute epididymitis
  67. Most common cause of acute testicular pain in prepubertal male : Torsion
  68. Most common cause of AIDS cholangiopathy : Cryptosporidium
  69. Most common cause of an echogenic renal mass in a 3-month-old : Mesoblastic nephroma.
  70. Most common cause of an intraorbital mass lesion in adult : Pseudotumor of Orbit
  71. Most common cause of AS in Western world : Degenerative disease
  72. Most common cause of bilateral breast edema : CHF.
  73. Most common cause of bilateral echogenic renal cortex : Chronic glomerulonephritis.
  74. Most common cause of biliary obstruction : Choledocholithiasis
  75. Most common cause of bleeding between menstrual cycles : Endometrial hyperplasia.
  76. Most common cause of bronchopneumonia : Staphylococcal
  77. Most common cause of cancer deaths in males and females : Bronchogenic Carcinoma
  78. Most common cause of cause of infectious esophagitis : Candida Esophagitis
  79. Most common cause of cavitary (necrotic) pneumonia in a child : Strep pneum.
  80. Most common cause of Charcot joints : Diabetes mellitus
  81. Most common cause of CHF in a child : ALCAPA / aberrant left coronary artery
  82. Most common cause of CHF in a neonate : Hypoplastic Left Heart.
  83. Most common cause of chronic hydronephrosis in renal transplant : UV anastomosis stricture.
  84. Most common cause of colonic obstruction in adults : Malignancy
  85. Most common cause of colonic obstruction in the infant : Meconium plug syndrome in CF patients
  86. Most common cause of colovesical fistula : Diverticulitis
  87. Most common cause of congenital CNS infection : CMV.
  88. Most common cause of congenital duodenal obstruction : Duodenal atresia.
  89. Most common cause of congenital sensorineural hearing loss : Giant vestibular aqueduct syndrome
  90. Most common cause of cord ischemia : Thromboembolic disease
  91. Most common cause of coronary artery aneurysm in USA : Atherosclerosis
  92. Most common cause of coronary artery aneurysm Worldwide : Kawasaki
  93. Most common cause of cyanosis in a child : Tetralogy of Fallot
  94. Most common cause of cyanosis n newborn Transposition of great vessels
  95. Most common cause of death in a severe pelvic fracture : Hemorrhage.
  96. Most common cause of death in Ataxia –Telangiectasia : Respiratory failure.
  97. Most common cause of death in Jeune syndrome : Respiratory failure
  98. Most common cause of drop mets : Medulloblastoma
  99. Most common cause of dwarfism : Achondroplasia
  100. Most common cause of echogenic renal pyramids in children : Furosemide
  101. Most common cause of ejaculatory duct obstruction : Mullerian duct cyst ?
  102. Most common cause of endometriosis in girls <16 years of age : Obstructive müllerian duct anomalies
  103. Most common cause of end-stage renal disease : Diabetic Nephropathy
  104. Most common cause of epididymitis in males aged 15 to 35 years : Sexually transmitted diseases
  105. Most common cause of esophageal rupture : Iatrogenic
  106. Most common cause of exocrine pancreatic insufficiency in patients <30 years of age : CF
  107. Most common cause of facial hemipalsy : Bell palsy
  108. Most common cause of false-positive V/Q scan for acute PE : Previous pulmonary embolism
  109. Most common cause of fungal infection in AIDS patients : Cryptococcosis
  110. Most common cause of gastrocolic fistula : Gastric ulcer.
  111. Most common cause of heart failure in patients with COPD : Atherosclerotic heart disease
  112. Most common cause of hemifacial spasticity is vertebrobasilar dolichoectasia.
  113. Most common cause of hepatic calcifications : Infection
  114. Most common cause of hydronephrosis in the newborn male : Ureteropelvic junction
  115. Most common cause of hyperreflexive bladder : Spinal cord trauma
  116. Most common cause of increased nuchal thickness : Downs syndrome
  117. Most common cause of interstitial and airspace edema : CHF
  118. Most common cause of intradiaphragmatic cyst :Extralobar sequestration
  119. Most common cause of intraventricular hemorrhage :Disruption of the subependymal veins
  120. Most common cause of intussusception in children >6 years : Lymphoma
  121. Most common cause of large spherical pancreatic calcifications in children : Hereditary pancreatitis
  122. Most common cause of left atrial dilatation : Mitral regurgitation.
  123. Most common cause of leukokoria : Retinoblastoma.
  124. Most common cause of liver metastasis : Colon.
  125. Most common cause of lower extremity venous valve dysfunction : DVT.
  126. Most common cause of lower GI bleeding : Diverticulosis.
  127. Most common cause of malignancy of men in the world – Bronchogenic Carcinoma
  128. Most common cause of maternal peripartum death : Amniotic fluid embolism
  129. Most common cause of membranous croup : Staph. Aureus.
  130. Most common cause of microcolon: Meconium ileus.
  131. Most common cause of mortality in ulcerative colitis : Toxic megacolon.
  132. Most common cause of necrolytic migrating erythema : Glucagonoma
  133. Most common cause of neonatal nasal obstruction : Choanal atresia.
  134. Most common cause of Neonatal Pneumonia : Group B streptococcus.
  135. Most common cause of neonatal respiratory distress in full term/postmature infants – Meconium aspiration
  136. Most common cause of nephrocalcinosis in adults : Primary hyperparathyroidism
  137. Most common cause of non-immune hydrops in USA : Cardiac anomaly
  138. Most common cause of optic nerve enlargement : Optic nerve glioma
  139. Most common cause of orbital calcifications : Retinoblastoma
  140. Most common cause of orbital infection : Paranasal sinusitis
  141. Most common cause of osteoblastic bone metastases in an adult female : Breast cancer
  142. Most common cause of osteoblastic bone metastases in an adult male : Prostate cancer
  143. Most common cause of osteolytic bone metastases in a child : Neuroblastoma
  144. Most common cause of osteolytic bone metastases in an adult female : Breast cancer
  145. Most common cause of osteolytic bone metastases in an adult male : Lung cancer
  146. Most common cause of Osteomyelitis of spine : Penetrating direct trauma
  147. Most common cause of pancreatic lipomatosis in children : CF
  148. Most common cause of pleural eosinophilia : Air in the pleural space
  149. Most common cause of pneumoperitoneum : Ruptured duodenal ulcer.
  150. Most common cause of postpartum fever : Endometritis.
  151. Most common cause of pseudomyxoma peritonei : Appendiceal mucinous adenocarcinoma
  152. Most common cause of pseudoureterocele : Bladder tumor
  153. Most common cause of pulmonary hypoplasia : Diaphragmatic hernia
  154. Most common cause of pulmonary tumor embolus : Gastric carcinoma
  155. Most common cause of recurrent hip disloc. s/p hip arthroplasty : Acetabular component malposition
  156. Most common cause of reflux in child w/ non-duplicated collecting system: Short intramural ureter.
  157. Most common cause of renal vein thrombosis in adults : Nephrotic syndrome
  158. Most common cause of restrictive cardiomyopathy : Amyloid
  159. Most common cause of round pneumonia in children : Streptococcus.
  160. Most common cause of round pneumonia in children : Streptococcus
  161. Most common cause of small bowel obstruction : Adhesions
  162. Most common cause of squamous cell ca. in the renal pelvis : Chronic Infected stag horn calculus
  163. Most common cause of stridor in neonate and young infant : Laryngomalacia
  164. Most common cause of sudden cardiac death among young people Hypertrophic cardiomyopathy (HCM)
  165. Most common cause of SVC syndrome : Bronchogenic carcinoma
  166. Most common cause of testicular swelling : Hydrocele
  167. Most common cause of the pulmonary-renal syndrome : Microscopic polyangitis.
  168. Most common cause of the stripe sign on V/Q scan : COPD
  169. Most common cause of thoracic outlet syndrome : Scalene anticus.
  170. Most common cause of toxic mega colon : Pseudomembranous colitis.
  171. Most common cause of tree in bud appearance on CT : Bronchiolitis
  172. Most common cause of tricuspid stenosis : Rheumatic heart disease
  173. Most common cause of unilateral diaphragmatic paralysis : Malignant invasion
  174. Most common cause of unilateral nonperfused lung on V/Q scan : Bronchogenic carcinoma
  175. Most common cause of unilateral pulmonary edema : Prolonged unilateral dependent positioning
  176. Most common cause of urinary obstruction in boys : posterior urethral valves
  177. Most common cause of valvular heart disease in the United States : Degenerative
  178. Most common cause of vascular ring : Double arch.
  179. Most common cause of vertebra plana in children : EG
  180. Most common cause requiring bronchial artery embolization : CF
  181. Most common cause worldwide for cholangiocarcinoma : Clonorchis sinensis infestation
  182. Most common cerebellar neoplasm in children : Medulloblastoma
  183. Most common cerebral mass lesion in AIDS : Toxoplasmosis
  184. Most common chest radiograph finding seen in pts with an acute PE : Atelectasis
  185. Most common chest x-ray abnormality in the ICU : Atelectasis
  186. Most common child abuse facture : Diaphyseal fracture,
  187. Most common collagen disorder for a pleural effusion : SLE
  188. Most common colonic polyp : Hyperplastic polyp
  189. Most common colonic site for lymphoma : Cecum
  190. Most common complication of ERCP : Pancreatitis
  191. Most common complication of popliteal artery aneurysm : Distal ischemia (thrombosis/embolism)
  192. Most common complication with IVC filters : DVT.
  193. Most common component of mixed germ cell tumors : Embryonal Cell Carcinoma
  194. Most common congenital abnormality of GI tract : Meckel’s diverticulum
  195. Most common congenital anomaly of CNS in live births : Myelomeningocele
  196. Most common congenital defect of CNS : Anencephaly.
  197. Most common congenital head and neck cyst in a child : Thornwaldt cyst
  198. Most common congenital heart disease : Bicuspid aortic valve.
  199. Most common congenital intracranial tumor : Epidermoid or inclusion cyst
  200. Most common congenital lesion of bile ducts : Choledochal Cyst
  201. Most common congenital skeletal dysplasia : Achondroplasia.
  202. Most common congenital solid tumor in the newborn : Sacrococcygeal Teratoma (1:40K live births)
  203. Most common cranial nerve affected by a pituitary macroadenoma : CN VI.
  204. Most common cranial nerve to be affected with schwannoma : VIII
  205. Most common craniofacial malformation : Facial Clefting
  206. Most common crystalline arthropathy : CPPD
  207. Most common CT finding in bowel ischemia : Bowel wall thickening.
  208. Most common cyanotic congenital heart malformation beyond neonatal period : TOF
  209. Most common cyst of the jaw : Radicular cyst = Periapical cyst
  210. Most common cystic lesion of prostate : Cystic degeneration of BPH
  211. Most common cystic tumor of pancreas : Mucinous cystic neoplasm
  212. Most common diffuse breast disorder : Fibrocystic disease of breast.
  213. Most common diffuse gray matter degenerative disease : Alzheimer’s
  214. Most common dislocated auditory ossicle longitudinal temporal bone fracture : Incus
  215. Most common dislocation in adult : Glenohumeral.
  216. Most common dislocation in child : Elbow.
  217. Most common epididymal neoplasm : Adenomatoid tumor
  218. Most common estrogenic ovarian tumor : Granulosa Cell Tumor
  219. Most common etiology for chronic temporal lobe epilepsy : Ganglioglioma
  220. Most common etiology for multiple small gastric polyps : Hyperplastic polyps.
  221. Most common etiology for osteomyelitis : Staphylococcus aureus.
  222. Most common etiology of bilaterally enlarged, hyperechoic kidneys in newborn infant : ARPKD.
  223. Most common etiology of mesenteric adenitis : Viral
  224. Most common etiology of pneumomediastinum : Alveolar rupture.
  225. Most common etiology of rickets : Vitamin D deficiency.
  226. Most common extra-adrenal site of pheochromocytoma : Organ of Zuckerkandl.
  227. Most common extraaxial neoplasm of CNS : Meningioma
  228. Most common extragonadal site of primary germ cell tumors : Anterior mediastinum.
  229. Most common extrapulmonary site of tuberculosis : Urinary tract
  230. Most common fetal cardiac anomaly seen on 4 chamber view US : AV canal defect (aka ECD)
  231. Most common fibromatosis in childhood : Infantile Myofibromatosis
  232. Most common finding of a tubal pregnancy seen on US images Adnexal mass separate from ovary
  233. Most common finding of contralateral kidney in MCKD : Reflux
  234. Most common fluid collection seen in transplant patients : Lymphoceles.
  235. Most common form of aortic stenosis : Valvular
  236. Most common form of carpal instability : DISI
  237. Most common form of emphysema in alpha-1 antitrypsin deficiency : Panlobular emphysema
  238. Most common form of emphysema in nonsmokers : Panlobular emphysema
  239. Most common form of emphysema in smokers : Centrilobular emphysema
  240. Most common form of hypertrophic cardiomyopathy : Asymmetric involvement of the interventricular septum
  241. Most common form of skeletal dysplasia : Acquired skeletal dysplasia.
  242. Most common form of systemic vasculitis in adults : Giant cell (temporal) arteritis
  243. Most common fracture of forearm : Colles
  244. Most common functional tumors of the ovary : Sex cord–stromal tumors
  245. Most common fungal infection in AIDS : Cryptococcus.
  246. Most common genitourinary organ affected by neurofibromas : Urinary bladder
  247. Most common germ cell tumor associated with excessive hCG production :Choriocarcinoma.
  248. Most common germ cell tumor associated with excessive hCG production after choriocarcinoma : Dysgerminoma.
  249. Most common GI neoplasm : Adenoma
  250. Most common GI tract location for primary extranodal lymphoma : Stomach, usually NHL type.
  251. Most common glial tumor in adults : Ependymoma
  252. Most common glial tumor in NF 1 : JPA.
  253. Most common glial tumor with microcalcifications : Oligodendroglioma
  254. Most common gynecologic neoplasm : Uterine Leiomyoma
  255. Most common hereditary hypercoagulable condition : Factor V Leiden
  256. Most common hereditary leukodystrophy : Metachromatic leukodystrophy
  257. Most common histologic type of bronchogenic carcinoma associated with cavitation : Squamous
  258. Most common histologic type of bronchogenic carcinoma associated with pancoast tumor : Squamous
  259. Most common histologic type of bronchogenic carcinoma associated with pleural effusion : Adenocarcinoma
  260. Most common histologic type of lung cancer associated with asbestosis exposure : BAC
  261. Most common histologic type of primary cutaneous lymphoma :T-cell lymphoma
  262. Most common ILD to be found in association with collagen vascular disease : NSIP
  263. Most common indication for percutaneous vertebroplasty : Osteoporosis.
  264. Most common infection to cause cerebellar hypoplasia & migration anomalies : CMV
  265. Most common infratentorial neoplasm in an adult : Metastases
  266. Most common inherited disease among Caucasian Americans : CF
  267. Most common internal enhancement pattern in DCIS with non mass like enhancement : Clumped enhancement
  268. Most common intracranial for site of teratomas : Pineal region.
  269. Most common intracranial presentation of TB : Tuberculous meningitis.
  270. Most common intramedullary spinal neoplasm in adults : Ependymoma of Spinal Cord
  271. Most common intramedullary tumor in children : Astrocytoma
  272. Most common intramedullary tumor of adults : Ependymoma.
  273. Most common intraocular neoplasm in childhood : Retinoblastoma
  274. Most common intraorbital tumors found in adults : Cavernous hemangiomas.
  275. Most common intrathoracic fetal anomaly : Congenital diaphragmatic Hernia
  276. Most common intrathoracic foregut cyst : Bronchogenic Cyst
  277. Most common intrauterine CNS infection : CMV
  278. Most common intravascular venous tumor : Leiomyosarcoma of IVC
  279. Most common in-utero renal tumor : Mesoblastic nephroma.
  280. Most common invasive gynecologic malignancy : Endometrial malignancy
  281. Most common islet cell tumor in MEN 1 : Gastrinoma
  282. Most common islet cell tumor of the pancreas : Insulinoma.
  283. Most common joint involved in synovial osteochondromatosis : Knee
  284. Most common lesion to cause expansion of paranasal sinus : Mucocele
  285. Most common lethal bone dysplasia : Osteogenesis imperfecta type II ?
  286. Most common liver tumor after metastases : Hemangioma
  287. Most common lobe affected in bronchial atresia : Left upper lobe.
  288. Most common location for a cephalhematoma : Parietal
  289. Most common location for a gastric diverticulum : Posterior wall of the gastric fundus.
  290. Most common location for a pilocytic astrocytoma : Cerebellum
  291. Most common location for a solitary myeloma of the bone : Thoracolumbar spine
  292. Most common location for a synovial sarcoma : Knee
  293. Most common location for a Tarlov cyst : Posterior rootlets of S2 + S3
  294. Most common location for abdominal sarcoid involvement : Stomach
  295. Most common location for atelectatic asbestos pseudotumor : Posteromedial & -lateral basal region of lower lobes
  296. Most common location for chordomas : Sacral spine.
  297. Most common location for gallbladder perforation : Fundus
  298. Most common location for Sclerosing Osteomyelitis of Garré (sterile Osteomyelitis) : Mandible
  299. Most common location for typhlitis : Cecum.
  300. Most common location for well-differentiated liposarcoma : Thigh
  301. Most common location in biliary tree for cholangiocarcinoma : Upper third/perihilar region.
  302. Most common location in the spine for an osteochondroma : Cervical (C2) followed by thoracic T8
  303. Most common location of a meningioma in the spine : Thoracic spinal cord
  304. Most common location of a periurethral diverticulum in a female : Posterolateral.
  305. Most common location of an ectopic pregnancy : Ampullary region of the fallopian tube.
  306. Most common location of benign and malignant masses in breast : Upper outer quadrant
  307. Most common location of bronchogenic carcinoma : Right upper lobe
  308. Most common location of coarctation : Postductal beyond the origin of the left subclavian artery.
  309. Most common location of coronary calcifications : LAD.
  310. Most common location of DAI : Frontotemporal gray–white matter junction.
  311. Most common location of GIST : Stomach.
  312. Most common location of GU obstruction in a neonatal male : Ureteropelvic junction.
  313. Most common location of intracranial dissection : Vertebral arteries.
  314. Most common location of intraorbital abscess : Subperiosteal space on medial wall.
  315. Most common location of intraventricular meningioma : Atrium of the lateral ventricle.
  316. Most common location of oligodendroglioma : Frontal lobe.
  317. Most common location of pleomorphic xanthoastrocytoma : Temporal lobes.
  318. Most common location of pulmonary sequestration : Posterior medial lower.
  319. Most common location of PVNS : Knee.
  320. Most common location of sarcoidosis in spinal cord : Cervical.
  321. Most common location of the biliary embryonal Rhabdomyosarcoma : CBD
  322. Most common location of triquetral fracture is dorsal avulsion
  323. Most common location to find a lithopedion : Adnexae
  324. Most common location to see intravertebral vacuum phenomenon (Kümmell Disease) : Thoracolumbar junction
  325. Most common lung infection in HIV: Bacterial pneumonia
  326. Most common lung mass : Granuloma
  327. Most common lysosomal storage disorder : Gaucher’s disease
  328. Most common malformation associated with callosal agenesis : Dandy-Walker malformation.
  329. Most common malignancy of childhood : Leukemia.
  330. Most common malignancy of parotid gland in adult : Mucoepidermoid carcinoma.
  331. Most common malignant abdominal neoplasm in children 1–8 years old : Wilms Tumor.
  332. Most common malignant bone tumor in children : Ewings
  333. Most common malignant cause of bilateral global renal enlargement : Lymphoma.
  334. Most common malignant neoplasm of diaphragm : Fibrosarcoma.
  335. Most common malignant neoplasm of the spleen : Lymphoma.
  336. Most common malignant ovarian neoplasm : Serous adenocarcinoma.
  337. Most common malignant ovarian neoplasm : Serous cystadenocarcinoma.
  338. Most common malignant primary bone tumor in young adults + children : Osteosarcoma
  339. Most common malignant radiation-induced tumor of the musculoskeletal system : MFH
  340. Most common malignant sex cord–stromal tumor : Granulosa cell tumor
  341. Most common malignant testicular neoplasm : Nonseminomatous germ cell tumors
  342. Most common malignant tumor affecting ribs of children + adolescents : Ewings Sarcoma
  343. Most common malignant tumor of the abdomen in patients with NF1 Malignant peripheral nerve sheath tumor
  344. Most common malignant tumor of the duodenum : Adenocarcinoma.
  345. Most common malignant tumor of the heart : Angiosarcoma
  346. Most common malignant tumor of the small bowel : Carcinoid
  347. Most common mammographic finding in DCIS : Microcalcifications
  348. Most common mammographic finding in Infiltrating/Invasive Lobular Carcinoma : Architectural distortion.
  349. Most common manifestation of asbestosis exposure : Pleural plaques
  350. Most common manifestation of asbestos-related pleural disease : Pleural effusion
  351. Most common manifestation of blunt chest trauma : Pulmonary contusion
  352. Most common mass lesion of the cerebellopontine angle after acoustic schwannoma : Meningioma
  353. Most common mediastinal germ cell tumor : Seminoma.
  354. Most common mediastinal mass in a child between the ages of 6 & 12 years old : Lymphoma
  355. Most common mediastinal neurogenic tumor : Schwannoma
  356. Most common mesenchymal origin neoplasm of GI tract : GIST
  357. Most common metabolic liver disease in children : Hepatic cirrhosis in homozygous alpha-1 Antitrypsin Deficiency
  358. Most common metastases to the spleen : Breast carcinoma
  359. Most common metastasis to the heart : Melanoma
  360. Most common metastatic cause of linitis plastica : Breast carcinoma
  361. Most common metatarsal to have a stress fracture : Second metatarsal.
  362. Most common missed type of breast cancer on mammography : Infiltrating/Invasive Lobular Carcinoma.
  363. Most common mitral valve abnormality in the Western world : Non-rheumatic mitral valve disease.
  364. Most common monodermal teratoma : Struma ovarii.
  365. Most common motor neuron disease : ALS.
  366. Most common MR imaging finding in DCIS : Non-masslike enhancement.
  367. Most common mycotic pneumonia in an AIDS patient : Cryptococcus.
  368. Most common natural outcome of the VSD : Spontaneous complete closure.
  369. Most common neonatal cyanotic congenital heart malformation : TGV
  370. Most common neonatal lesion of adrenal gland : Nontraumatic Adrenal Hemorrhage.
  371. Most common neoplasm of conus medullaris : Myxopapillary Ependymoma of Spinal Cord.
  372. Most common neoplasm of internal auditory canal / cerebellopontine angle : Vestibular Schwannoma.
  373. Most common neoplasm of the gastrointestinal tract in patients with NF1: Neurofibromas.
  374. Most common nerve to be involved in tarsal tunnel syndrome : Posterior tibial nerve.
  375. Most common nonepidemic meningoencephalitis in immunocompetent individuals in US : Herpes Encephalitis.
  376. Most common nonepithelial malignant bladder tumor : Leiomyosarcoma.
  377. Most common nonepithelial tumor in the colon : Lipoma.
  378. Most common nonepithelial tumor of the bladder : Leiomyoma.
  379. Most common nonglial primary tumors of the central nervous system : Meningiomas.
  380. Most common nonlymphoproliferative primary malignant tumor of the spine in adults : Chordoma.
  381. Most common nonlymphoproliferative primary malignant tumor of the spine in children : PNET.
  382. Most common nontraumatic cause of acute limp in a child : Toxic synovitis.
  383. Most common non-traumatic cause of facial nerve paralysis & hearing loss : CPA tumor.
  384. Most common odontogenic mass : Odontoma= odontogenic hamartomatous malformation.
  385. Most common of all alimentary tract duplications : Small Bowel Duplication Cyst.
  386. Most common of cerebral vascular malformation : DVA.
  387. Most common opportunistic infection in AIDS : Toxoplasmosis.
  388. Most common organism involved in pancreatic abscess : E. Coli.
  389. Most common organism of acute pyogenic meningitis in infants & children : N. meningitides.
  390. Most common origin of cystic artery : Right hepatic artery.
  391. Most common osteochondrodysplasia : Hereditary Multiple Exostoses
  392. Most common ovarian neoplasm : Dermoid aka dermoid cyst = Mature cystic teratoma
  393. Most common ovarian tumor-related morbidity : Bowel obstruction
  394. Most common pancreatic abnormality in adult pt’s with CF : Complete fatty replacement
  395. Most common paraneoplastic disease associated with thymoma : Myasthenia gravis
  396. Most common parasitic infection involving CNS in developing countries : Cysticercosis
  397. Most common parotid disease in children : Mumps parotitis.
  398. Most common pattern of bronchial arteries : Two left & one right bronchial artery
  399. Most common pattern of enhancement at DE MR cardiac imaging : Patchy midwall enhancement with multiple foci
  400. Most common pattern of hepatic involvement of secondary lymphoma : Diffuse infiltrative
  401. Most common pattern of spread in Gallbladder Carcinoma : Direct spread.
  402. Most common pediatric glioma : JPA
  403. Most common pediatric tumor causing isosexual precocious puberty in a girl : Granulosa cell tumor
  404. Most common phakomatoses : NF1
  405. Most common pineal tumor : Pineal Germinoma
  406. Most common predisposing cause to develop pneumothorax during percutaneous lung biopsy : COPD
  407. Most common predisposing disorder of secondary spontaneous pneumothorax : COPD
  408. Most common pregnancy-related mortality in the first trimester Ectopic pregnancy
  409. Most common presentation for idiopathic pulmonary fibrosis : Dyspnea
  410. Most common presentation in stuck twin syndrome : Monochorionic diamniotic
  411. Most common presentation of bronchoalveolar cell carcinoma (BAC) : Solitary pulmonary nodule.
  412. Most common presentation of GIST on cross sectional imaging : Cystic areas of necrosis.
  413. Most common presentation of mesoblastic nephroma : Palpable mass at birth.
  414. Most common presentation of neurocysticercosis : Seizures.
  415. Most common presenting symptom of Osler Weber Rendu : Hemoptysis.
  416. Most common primary benign mesenteric tumor : Desmoid.
  417. Most common primary brain tumor : GBM.
  418. Most common primary cardiac tumors in adults : Myxomas.
  419. Most common primary cerebellar mass in an adult : Hemangioblastoma
  420. Most common primary demyelinating disease : MS
  421. Most common primary female urethral malignancy : Squamous cell carcinoma
  422. Most common primary hepatic neoplasm in infants & children <5 years old : Hepatoblastoma
  423. Most common primary intraocular neoplasm in adult Caucasian : Uveal Melanoma
  424. Most common primary lung tumor under age 16 : Bronchial Adenoma
  425. Most common primary malignant rib tumor : Chondrosarcoma
  426. Most common primary malignant sacral tumor : Sacrococcygeal Chordoma
  427. Most common primary malignant soft-tissue tumor of late adult life : Soft-tissue MFH
  428. Most common primary neoplasm of the spleen : Cavernous hemangioma
  429. Most common primary neoplasms of the anterior superior mediastinum Thymomas.
  430. Most common primary posterior mediastinal neoplasms :Neurogenic tumors
  431. Most common primary tumor of the diaphragm : Lipoma
  432. Most common radiation-induced CNS tumor : Meningioma
  433. Most common reason for cardiac transplantation : Dilated cardiomyopathy
  434. Most common recognized CNS manifestation of VHL disease : Hemangioblastoma of CNS
  435. Most common relevant finding on cavogram for IVC filter placement : Circumaortic left renal vein.
  436. Most common renal fusion anomaly : Horseshoe kidney
  437. Most common renal mass in a 3 months old infant : Mesoblastic nephroma
  438. Most common respiratory cause of cold agglutinin production : Mycoplasma pneumonia
  439. Most common retinal infection in AIDS : Toxoplasmosis
  440. Most common right cardiophrenic angle mass : Epicardial fat-pad/lipoma
  441. Most common segment involved in tracheobronchial injury : Right lower lobe bronchus.
  442. Most common sex cord-stromal cell tumor : Ovarian Fibroma
  443. Most common sign of failing dialysis graft : Increased venous pressures
  444. Most common sign of tuberous sclerosis : Myoclonic seizures
  445. Most common single cause of breast lumps in females between 35 to 55 years of age : Breast cyst
  446. Most common site for an intracardiac papillary fibroelastoma : Aortic valve.
  447. Most common site for aneurysm in the chest : Descending thoracic aorta.
  448. Most common site for cardiac myxoma : Left atrium
  449. Most common site for intra cardiac thrombus formation : Atrial appendage.
  450. Most common site for optic melanoma metastases : Liver.
  451. Most common site for penetrating aortic ulcers : Descending thoracic aorta
  452. Most common site of abdominal involvement in Hodgkins disease : Spleen
  453. Most common site of aortic dissection : Prox. Desc. Thoracic aorta near ductus lig. attachment
  454. Most common site of biliary tract injury caused by blunt abdominal trauma : Gallbladder
  455. Most common site of monostotic fibrous dysplasia : Ribs
  456. Most common site of rupture of sinus of Valsalva aneurysm : RV followed by RA.
  457. Most common solid extracranial tumor of childhood : Neuroblastoma
  458. Most common spermatic cord tumor : Lipoma
  459. Most common spinal cord segment of lymphoma of spinal cord : Cervical
  460. Most common spinal cord tumor : Ependymoma
  461. Most common spinal location for cord astrocytoma : Thoracic
  462. Most common spinal location for cord ependymoma : Cervical
  463. Most common subcortical degenerative disease : Parkinson’s
  464. Most common subglottic soft-tissue upper resp. tract obstructing mass in neonates : Subglottic Hemangioma
  465. Most common submucosal tumor in colon : Lipoma
  466. Most common subtype of NHL involving the esophagus : Diffuse large B-cell lymphoma
  467. Most common subtype of renal cell carcinoma : Clear cell adenocarcinomas
  468. Most common suprasellar mass : Craniopharyngioma
  469. Most common syndromic islet cell tumor : Insulinoma
  470. Most common systemic allergic hypersensitivity-related acute small-vessel vasculitis in children : HSP
  471. Most common systemic fungal infection in immunocompromised patients : Candidiasis Of Liver
  472. Most common tarsal bone to get fractured : Calcaneus
  473. Most common tarsal coalition : Talocalcaneal
  474. Most common testicular tumor in a young boy : Yolk sac tumor
  475. Most common tibial plateau fractures : Lateral tibial plateau (Schatzker classification type I–III)
  476. Most common trigonal intraventricular mass in adulthood : Meningioma
  477. Most common tumor of adenohypophysis : Pituitary Adenoma
  478. Most common tumor of genitourinary tract : Metachronous TCC
  479. Most common tumor of the appendix : Carcinoid
  480. Most common tumor of the esophagus : Leiomyomas
  481. Most common tumor of the minor salivary glands : Adenoid Cystic Carcinoma
  482. Most common type of abdominal wall hernia : Inguinal hernia
  483. Most common type of ASD : Ostium secundum
  484. Most common type of brain hernaition : anterior / uncal transtentorial
  485. Most common type of brain herniation : Subfalcine herniation
  486. Most common type of C2 fractures : Type 2
  487. Most common type of cancer to arise from a thyroglossal duct cyst : Papillary carcinoma
  488. Most common type of cardiomyopathy : Dilated cardiomyopathy
  489. Most common type of choledochal cyst : fusiform dilatation of the extrahepatic duct Type 1c
  490. Most common type of congenital internal hernia : Left paraduodenal hernia
  491. Most common type of encephalocele in SE Asia: Sincipital Encephalocele
  492. Most common type of encephalocele in US : Occipital Encephalocele
  493. Most common type of endoleak in the abdominal aorta : Type II endoleak
  494. Most common type of endoleak in the thoracic aorta : Type I endoleak
  495. Most common type of fracture of the proximal 5th metatarsal bone : Peroneus brevis avulsion fracture.
  496. Most common type of gallbladder inflammation : Chronic cholecystitis
  497. Most common type of internal hernia : Postoperative, transmesenteric hernias.
  498. Most common type of intrapulmonary involvement of Hodgkins disease : Bronchovascular form.
  499. Most common type of liver abscess : Pyogenic Liver Abscess
  500. Most common type of lymphoma involving the head and neck region : Diffuse large B-cell lymphoma