500 MOST COMMONS
- Most common aortic branch involved in Takayasu arteritis : Left subclavian
- Most common cause of respiratory distress in newborn : Transient tachypnea of the newborn
- Most common location to see Asbestosis sequale : Posterior lower lobes.
- Most common karyotype / chromosomal abnormality in USA : Down’s syndrome
- Most common osseous lymphoma, primary and secondary : Diffuse large B-cell lymphoma
- Most common primary malignant orbital tumor in childhood : Rhabdomyosarcoma
- Most common type of fluid collection in scrotum : Hydrocele
- Most common type of liposarcoma to affect children : Myxoid liposarcoma
- Most common abdominal emergency of early childhood : Intussusception.
- Most common acetabular fracture : Posterior acetabulum.
- Most common affected bowel segment in TB : Ileocecal area.
- Most common affected joint in gout : First MTP.
- Most common AIDS-related neoplasm : Kaposi Sarcoma
- Most common allergic aspergillosis syndrome : Allergic bronchopulmonary aspergillosis.
- Most common anatomic variant of pancreas : Pancreas divisum
- Most common anomalous course of RCA : Interarterial
- Most common appearance of Legionella at the peak of the disease : Bilateral airspace consolidation.
- Most common assoc. w/ Fx of great toe distal phalanx with physeal involvement :Osteomyelitis.
- Most common associated anomaly with coarctation : Bicuspid valve.
- Most common association of PAPVR : Sinus venosus type ASD.
- Most common association with small left colon syndrome : Maternal DM
- Most common bacterial cause of mesenteric adenitis : Yersinia enterocolitica.
- Most common benign cardiac rhythm abnormality : PAC
- Most common benign cartilage-containing tumor : Osteochondroma
- Most common benign growth of the skeleton : Osteochondroma
- Most common benign hepatic lesion : Hemangioma
- Most common benign hepatic tumor during fist 6 mo. of life : Infantile Hemangioendothelioma
- Most common benign intraconal tumor of the orbit in adults : Cavernous hemangiomas.
- Most common benign masses caused by asbestos exposure : Atelectatic Asbestos Pseudotumor
- Most common benign mesenchymal tumor of kidney : AML
- Most common benign mucosal tumor of the esophagus : Papilloma
- Most common benign nasopharyngeal tumor : Juvenile angiofibroma.
- Most common benign orbital tumor in childhood : Dermoid Cyst of Orbit
- Most common benign ovarian neoplasm in young and middle-aged women (<45 years) :Mature teratoma
- Most common benign radiation-induced tumor of the musculoskeletal system : Osteochondroma
- Most common benign rib lesion in an adult : Fibrous dysplasia.
- Most common benign soft-tissue tumor of the foot : Plantar fibromatosis
- Most common benign soft-tissue tumor of vascular origin : Hemangioma
- Most common benign solid tumor in women of childbearing age : Fibroadenoma
- Most common benign testicular mass : Simple cyst
- Most common benign tumor of spleen : Hemangioma
- Most common benign tumor of the larynx : Squamous papilloma
- Most common benign tumor of the lung : Hamartoma
- Most common benign tumor of the small bowel : GIST
- Most common benign vascular gastric tumor : Glomus tumor of stomach.
- Most common bilateral testicular tumor : Lymphoma
- Most common biliary complication s/p lap. cholecystectomy : Bile duct leak from cystic duct stump.
- Most common biliary complication s/p liver transplantation : Obstruction/stenosis at anastomosis.
- Most common bladder neoplasm in children younger than 10 years : Rhabdomyosarcoma
- Most common bone to develop an osteochondroma : Femur (tibia second most common)
- Most common brain anomaly on prenatal sonograms : Isolated Mild Ventriculomegaly
- Most common breast tumor under age 25 years : Fibroadenoma
- Most common cardiac manifestation of Systemic Lupus Erythematous : Pericarditis
- Most common cardiac tumor in children : Rhabdomyoma.
- Most common cardiac valvular tumor : Papillary fibroelastoma
- Most common carpal dislocation : Transscaphoid perilunate dislocation.
- Most common causative organism of acute pyogenic meningitis in adults : Strep. pneumoniae
- Most common causative organism of neonatal pyogenic meningitis : E. coli
- Most common cause for failure of dialysis graft : Fibrointimal hyperplasia : venous outflow stenosis.
- Most common cause for late failure in lung transplant patient : Bronchiolitis obliterans
- Most common cause for pulmonary edema : Left-sided heart disease
- Most common cause non iatrogenic cause of small bowel obstruction : Hernia
- Most common cause of a large choroid plexus cyst : Trisomy 18.
- Most common cause of a large pleural fluid collection in the newborn period : Chylothorax
- Most common cause of acute renal failure in children requiring dialysis : HUS
- Most common cause of acute testicular pain in postpubertal male : Acute epididymitis
- Most common cause of acute testicular pain in prepubertal male : Torsion
- Most common cause of AIDS cholangiopathy : Cryptosporidium
- Most common cause of an echogenic renal mass in a 3-month-old : Mesoblastic nephroma.
- Most common cause of an intraorbital mass lesion in adult : Pseudotumor of Orbit
- Most common cause of AS in Western world : Degenerative disease
- Most common cause of bilateral breast edema : CHF.
- Most common cause of bilateral echogenic renal cortex : Chronic glomerulonephritis.
- Most common cause of biliary obstruction : Choledocholithiasis
- Most common cause of bleeding between menstrual cycles : Endometrial hyperplasia.
- Most common cause of bronchopneumonia : Staphylococcal
- Most common cause of cancer deaths in males and females : Bronchogenic Carcinoma
- Most common cause of cause of infectious esophagitis : Candida Esophagitis
- Most common cause of cavitary (necrotic) pneumonia in a child : Strep pneum.
- Most common cause of Charcot joints : Diabetes mellitus
- Most common cause of CHF in a child : ALCAPA / aberrant left coronary artery
- Most common cause of CHF in a neonate : Hypoplastic Left Heart.
- Most common cause of chronic hydronephrosis in renal transplant : UV anastomosis stricture.
- Most common cause of colonic obstruction in adults : Malignancy
- Most common cause of colonic obstruction in the infant : Meconium plug syndrome in CF patients
- Most common cause of colovesical fistula : Diverticulitis
- Most common cause of congenital CNS infection : CMV.
- Most common cause of congenital duodenal obstruction : Duodenal atresia.
- Most common cause of congenital sensorineural hearing loss : Giant vestibular aqueduct syndrome
- Most common cause of cord ischemia : Thromboembolic disease
- Most common cause of coronary artery aneurysm in USA : Atherosclerosis
- Most common cause of coronary artery aneurysm Worldwide : Kawasaki
- Most common cause of cyanosis in a child : Tetralogy of Fallot
- Most common cause of cyanosis n newborn Transposition of great vessels
- Most common cause of death in a severe pelvic fracture : Hemorrhage.
- Most common cause of death in Ataxia –Telangiectasia : Respiratory failure.
- Most common cause of death in Jeune syndrome : Respiratory failure
- Most common cause of drop mets : Medulloblastoma
- Most common cause of dwarfism : Achondroplasia
- Most common cause of echogenic renal pyramids in children : Furosemide
- Most common cause of ejaculatory duct obstruction : Mullerian duct cyst ?
- Most common cause of endometriosis in girls <16 years of age : Obstructive müllerian duct anomalies
- Most common cause of end-stage renal disease : Diabetic Nephropathy
- Most common cause of epididymitis in males aged 15 to 35 years : Sexually transmitted diseases
- Most common cause of esophageal rupture : Iatrogenic
- Most common cause of exocrine pancreatic insufficiency in patients <30 years of age : CF
- Most common cause of facial hemipalsy : Bell palsy
- Most common cause of false-positive V/Q scan for acute PE : Previous pulmonary embolism
- Most common cause of fungal infection in AIDS patients : Cryptococcosis
- Most common cause of gastrocolic fistula : Gastric ulcer.
- Most common cause of heart failure in patients with COPD : Atherosclerotic heart disease
- Most common cause of hemifacial spasticity is vertebrobasilar dolichoectasia.
- Most common cause of hepatic calcifications : Infection
- Most common cause of hydronephrosis in the newborn male : Ureteropelvic junction
- Most common cause of hyperreflexive bladder : Spinal cord trauma
- Most common cause of increased nuchal thickness : Downs syndrome
- Most common cause of interstitial and airspace edema : CHF
- Most common cause of intradiaphragmatic cyst :Extralobar sequestration
- Most common cause of intraventricular hemorrhage :Disruption of the subependymal veins
- Most common cause of intussusception in children >6 years : Lymphoma
- Most common cause of large spherical pancreatic calcifications in children : Hereditary pancreatitis
- Most common cause of left atrial dilatation : Mitral regurgitation.
- Most common cause of leukokoria : Retinoblastoma.
- Most common cause of liver metastasis : Colon.
- Most common cause of lower extremity venous valve dysfunction : DVT.
- Most common cause of lower GI bleeding : Diverticulosis.
- Most common cause of malignancy of men in the world – Bronchogenic Carcinoma
- Most common cause of maternal peripartum death : Amniotic fluid embolism
- Most common cause of membranous croup : Staph. Aureus.
- Most common cause of microcolon: Meconium ileus.
- Most common cause of mortality in ulcerative colitis : Toxic megacolon.
- Most common cause of necrolytic migrating erythema : Glucagonoma
- Most common cause of neonatal nasal obstruction : Choanal atresia.
- Most common cause of Neonatal Pneumonia : Group B streptococcus.
- Most common cause of neonatal respiratory distress in full term/postmature infants – Meconium aspiration
- Most common cause of nephrocalcinosis in adults : Primary hyperparathyroidism
- Most common cause of non-immune hydrops in USA : Cardiac anomaly
- Most common cause of optic nerve enlargement : Optic nerve glioma
- Most common cause of orbital calcifications : Retinoblastoma
- Most common cause of orbital infection : Paranasal sinusitis
- Most common cause of osteoblastic bone metastases in an adult female : Breast cancer
- Most common cause of osteoblastic bone metastases in an adult male : Prostate cancer
- Most common cause of osteolytic bone metastases in a child : Neuroblastoma
- Most common cause of osteolytic bone metastases in an adult female : Breast cancer
- Most common cause of osteolytic bone metastases in an adult male : Lung cancer
- Most common cause of Osteomyelitis of spine : Penetrating direct trauma
- Most common cause of pancreatic lipomatosis in children : CF
- Most common cause of pleural eosinophilia : Air in the pleural space
- Most common cause of pneumoperitoneum : Ruptured duodenal ulcer.
- Most common cause of postpartum fever : Endometritis.
- Most common cause of pseudomyxoma peritonei : Appendiceal mucinous adenocarcinoma
- Most common cause of pseudoureterocele : Bladder tumor
- Most common cause of pulmonary hypoplasia : Diaphragmatic hernia
- Most common cause of pulmonary tumor embolus : Gastric carcinoma
- Most common cause of recurrent hip disloc. s/p hip arthroplasty : Acetabular component malposition
- Most common cause of reflux in child w/ non-duplicated collecting system: Short intramural ureter.
- Most common cause of renal vein thrombosis in adults : Nephrotic syndrome
- Most common cause of restrictive cardiomyopathy : Amyloid
- Most common cause of round pneumonia in children : Streptococcus.
- Most common cause of round pneumonia in children : Streptococcus
- Most common cause of small bowel obstruction : Adhesions
- Most common cause of squamous cell ca. in the renal pelvis : Chronic Infected stag horn calculus
- Most common cause of stridor in neonate and young infant : Laryngomalacia
- Most common cause of sudden cardiac death among young people Hypertrophic cardiomyopathy (HCM)
- Most common cause of SVC syndrome : Bronchogenic carcinoma
- Most common cause of testicular swelling : Hydrocele
- Most common cause of the pulmonary-renal syndrome : Microscopic polyangitis.
- Most common cause of the stripe sign on V/Q scan : COPD
- Most common cause of thoracic outlet syndrome : Scalene anticus.
- Most common cause of toxic mega colon : Pseudomembranous colitis.
- Most common cause of tree in bud appearance on CT : Bronchiolitis
- Most common cause of tricuspid stenosis : Rheumatic heart disease
- Most common cause of unilateral diaphragmatic paralysis : Malignant invasion
- Most common cause of unilateral nonperfused lung on V/Q scan : Bronchogenic carcinoma
- Most common cause of unilateral pulmonary edema : Prolonged unilateral dependent positioning
- Most common cause of urinary obstruction in boys : posterior urethral valves
- Most common cause of valvular heart disease in the United States : Degenerative
- Most common cause of vascular ring : Double arch.
- Most common cause of vertebra plana in children : EG
- Most common cause requiring bronchial artery embolization : CF
- Most common cause worldwide for cholangiocarcinoma : Clonorchis sinensis infestation
- Most common cerebellar neoplasm in children : Medulloblastoma
- Most common cerebral mass lesion in AIDS : Toxoplasmosis
- Most common chest radiograph finding seen in pts with an acute PE : Atelectasis
- Most common chest x-ray abnormality in the ICU : Atelectasis
- Most common child abuse facture : Diaphyseal fracture,
- Most common collagen disorder for a pleural effusion : SLE
- Most common colonic polyp : Hyperplastic polyp
- Most common colonic site for lymphoma : Cecum
- Most common complication of ERCP : Pancreatitis
- Most common complication of popliteal artery aneurysm : Distal ischemia (thrombosis/embolism)
- Most common complication with IVC filters : DVT.
- Most common component of mixed germ cell tumors : Embryonal Cell Carcinoma
- Most common congenital abnormality of GI tract : Meckel’s diverticulum
- Most common congenital anomaly of CNS in live births : Myelomeningocele
- Most common congenital defect of CNS : Anencephaly.
- Most common congenital head and neck cyst in a child : Thornwaldt cyst
- Most common congenital heart disease : Bicuspid aortic valve.
- Most common congenital intracranial tumor : Epidermoid or inclusion cyst
- Most common congenital lesion of bile ducts : Choledochal Cyst
- Most common congenital skeletal dysplasia : Achondroplasia.
- Most common congenital solid tumor in the newborn : Sacrococcygeal Teratoma (1:40K live births)
- Most common cranial nerve affected by a pituitary macroadenoma : CN VI.
- Most common cranial nerve to be affected with schwannoma : VIII
- Most common craniofacial malformation : Facial Clefting
- Most common crystalline arthropathy : CPPD
- Most common CT finding in bowel ischemia : Bowel wall thickening.
- Most common cyanotic congenital heart malformation beyond neonatal period : TOF
- Most common cyst of the jaw : Radicular cyst = Periapical cyst
- Most common cystic lesion of prostate : Cystic degeneration of BPH
- Most common cystic tumor of pancreas : Mucinous cystic neoplasm
- Most common diffuse breast disorder : Fibrocystic disease of breast.
- Most common diffuse gray matter degenerative disease : Alzheimer’s
- Most common dislocated auditory ossicle longitudinal temporal bone fracture : Incus
- Most common dislocation in adult : Glenohumeral.
- Most common dislocation in child : Elbow.
- Most common epididymal neoplasm : Adenomatoid tumor
- Most common estrogenic ovarian tumor : Granulosa Cell Tumor
- Most common etiology for chronic temporal lobe epilepsy : Ganglioglioma
- Most common etiology for multiple small gastric polyps : Hyperplastic polyps.
- Most common etiology for osteomyelitis : Staphylococcus aureus.
- Most common etiology of bilaterally enlarged, hyperechoic kidneys in newborn infant : ARPKD.
- Most common etiology of mesenteric adenitis : Viral
- Most common etiology of pneumomediastinum : Alveolar rupture.
- Most common etiology of rickets : Vitamin D deficiency.
- Most common extra-adrenal site of pheochromocytoma : Organ of Zuckerkandl.
- Most common extraaxial neoplasm of CNS : Meningioma
- Most common extragonadal site of primary germ cell tumors : Anterior mediastinum.
- Most common extrapulmonary site of tuberculosis : Urinary tract
- Most common fetal cardiac anomaly seen on 4 chamber view US : AV canal defect (aka ECD)
- Most common fibromatosis in childhood : Infantile Myofibromatosis
- Most common finding of a tubal pregnancy seen on US images Adnexal mass separate from ovary
- Most common finding of contralateral kidney in MCKD : Reflux
- Most common fluid collection seen in transplant patients : Lymphoceles.
- Most common form of aortic stenosis : Valvular
- Most common form of carpal instability : DISI
- Most common form of emphysema in alpha-1 antitrypsin deficiency : Panlobular emphysema
- Most common form of emphysema in nonsmokers : Panlobular emphysema
- Most common form of emphysema in smokers : Centrilobular emphysema
- Most common form of hypertrophic cardiomyopathy : Asymmetric involvement of the interventricular septum
- Most common form of skeletal dysplasia : Acquired skeletal dysplasia.
- Most common form of systemic vasculitis in adults : Giant cell (temporal) arteritis
- Most common fracture of forearm : Colles
- Most common functional tumors of the ovary : Sex cord–stromal tumors
- Most common fungal infection in AIDS : Cryptococcus.
- Most common genitourinary organ affected by neurofibromas : Urinary bladder
- Most common germ cell tumor associated with excessive hCG production :Choriocarcinoma.
- Most common germ cell tumor associated with excessive hCG production after choriocarcinoma : Dysgerminoma.
- Most common GI neoplasm : Adenoma
- Most common GI tract location for primary extranodal lymphoma : Stomach, usually NHL type.
- Most common glial tumor in adults : Ependymoma
- Most common glial tumor in NF 1 : JPA.
- Most common glial tumor with microcalcifications : Oligodendroglioma
- Most common gynecologic neoplasm : Uterine Leiomyoma
- Most common hereditary hypercoagulable condition : Factor V Leiden
- Most common hereditary leukodystrophy : Metachromatic leukodystrophy
- Most common histologic type of bronchogenic carcinoma associated with cavitation : Squamous
- Most common histologic type of bronchogenic carcinoma associated with pancoast tumor : Squamous
- Most common histologic type of bronchogenic carcinoma associated with pleural effusion : Adenocarcinoma
- Most common histologic type of lung cancer associated with asbestosis exposure : BAC
- Most common histologic type of primary cutaneous lymphoma :T-cell lymphoma
- Most common ILD to be found in association with collagen vascular disease : NSIP
- Most common indication for percutaneous vertebroplasty : Osteoporosis.
- Most common infection to cause cerebellar hypoplasia & migration anomalies : CMV
- Most common infratentorial neoplasm in an adult : Metastases
- Most common inherited disease among Caucasian Americans : CF
- Most common internal enhancement pattern in DCIS with non mass like enhancement : Clumped enhancement
- Most common intracranial for site of teratomas : Pineal region.
- Most common intracranial presentation of TB : Tuberculous meningitis.
- Most common intramedullary spinal neoplasm in adults : Ependymoma of Spinal Cord
- Most common intramedullary tumor in children : Astrocytoma
- Most common intramedullary tumor of adults : Ependymoma.
- Most common intraocular neoplasm in childhood : Retinoblastoma
- Most common intraorbital tumors found in adults : Cavernous hemangiomas.
- Most common intrathoracic fetal anomaly : Congenital diaphragmatic Hernia
- Most common intrathoracic foregut cyst : Bronchogenic Cyst
- Most common intrauterine CNS infection : CMV
- Most common intravascular venous tumor : Leiomyosarcoma of IVC
- Most common in-utero renal tumor : Mesoblastic nephroma.
- Most common invasive gynecologic malignancy : Endometrial malignancy
- Most common islet cell tumor in MEN 1 : Gastrinoma
- Most common islet cell tumor of the pancreas : Insulinoma.
- Most common joint involved in synovial osteochondromatosis : Knee
- Most common lesion to cause expansion of paranasal sinus : Mucocele
- Most common lethal bone dysplasia : Osteogenesis imperfecta type II ?
- Most common liver tumor after metastases : Hemangioma
- Most common lobe affected in bronchial atresia : Left upper lobe.
- Most common location for a cephalhematoma : Parietal
- Most common location for a gastric diverticulum : Posterior wall of the gastric fundus.
- Most common location for a pilocytic astrocytoma : Cerebellum
- Most common location for a solitary myeloma of the bone : Thoracolumbar spine
- Most common location for a synovial sarcoma : Knee
- Most common location for a Tarlov cyst : Posterior rootlets of S2 + S3
- Most common location for abdominal sarcoid involvement : Stomach
- Most common location for atelectatic asbestos pseudotumor : Posteromedial & -lateral basal region of lower lobes
- Most common location for chordomas : Sacral spine.
- Most common location for gallbladder perforation : Fundus
- Most common location for Sclerosing Osteomyelitis of Garré (sterile Osteomyelitis) : Mandible
- Most common location for typhlitis : Cecum.
- Most common location for well-differentiated liposarcoma : Thigh
- Most common location in biliary tree for cholangiocarcinoma : Upper third/perihilar region.
- Most common location in the spine for an osteochondroma : Cervical (C2) followed by thoracic T8
- Most common location of a meningioma in the spine : Thoracic spinal cord
- Most common location of a periurethral diverticulum in a female : Posterolateral.
- Most common location of an ectopic pregnancy : Ampullary region of the fallopian tube.
- Most common location of benign and malignant masses in breast : Upper outer quadrant
- Most common location of bronchogenic carcinoma : Right upper lobe
- Most common location of coarctation : Postductal beyond the origin of the left subclavian artery.
- Most common location of coronary calcifications : LAD.
- Most common location of DAI : Frontotemporal gray–white matter junction.
- Most common location of GIST : Stomach.
- Most common location of GU obstruction in a neonatal male : Ureteropelvic junction.
- Most common location of intracranial dissection : Vertebral arteries.
- Most common location of intraorbital abscess : Subperiosteal space on medial wall.
- Most common location of intraventricular meningioma : Atrium of the lateral ventricle.
- Most common location of oligodendroglioma : Frontal lobe.
- Most common location of pleomorphic xanthoastrocytoma : Temporal lobes.
- Most common location of pulmonary sequestration : Posterior medial lower.
- Most common location of PVNS : Knee.
- Most common location of sarcoidosis in spinal cord : Cervical.
- Most common location of the biliary embryonal Rhabdomyosarcoma : CBD
- Most common location of triquetral fracture is dorsal avulsion
- Most common location to find a lithopedion : Adnexae
- Most common location to see intravertebral vacuum phenomenon (Kümmell Disease) : Thoracolumbar junction
- Most common lung infection in HIV: Bacterial pneumonia
- Most common lung mass : Granuloma
- Most common lysosomal storage disorder : Gaucher’s disease
- Most common malformation associated with callosal agenesis : Dandy-Walker malformation.
- Most common malignancy of childhood : Leukemia.
- Most common malignancy of parotid gland in adult : Mucoepidermoid carcinoma.
- Most common malignant abdominal neoplasm in children 1–8 years old : Wilms Tumor.
- Most common malignant bone tumor in children : Ewings
- Most common malignant cause of bilateral global renal enlargement : Lymphoma.
- Most common malignant neoplasm of diaphragm : Fibrosarcoma.
- Most common malignant neoplasm of the spleen : Lymphoma.
- Most common malignant ovarian neoplasm : Serous adenocarcinoma.
- Most common malignant ovarian neoplasm : Serous cystadenocarcinoma.
- Most common malignant primary bone tumor in young adults + children : Osteosarcoma
- Most common malignant radiation-induced tumor of the musculoskeletal system : MFH
- Most common malignant sex cord–stromal tumor : Granulosa cell tumor
- Most common malignant testicular neoplasm : Nonseminomatous germ cell tumors
- Most common malignant tumor affecting ribs of children + adolescents : Ewings Sarcoma
- Most common malignant tumor of the abdomen in patients with NF1 Malignant peripheral nerve sheath tumor
- Most common malignant tumor of the duodenum : Adenocarcinoma.
- Most common malignant tumor of the heart : Angiosarcoma
- Most common malignant tumor of the small bowel : Carcinoid
- Most common mammographic finding in DCIS : Microcalcifications
- Most common mammographic finding in Infiltrating/Invasive Lobular Carcinoma : Architectural distortion.
- Most common manifestation of asbestosis exposure : Pleural plaques
- Most common manifestation of asbestos-related pleural disease : Pleural effusion
- Most common manifestation of blunt chest trauma : Pulmonary contusion
- Most common mass lesion of the cerebellopontine angle after acoustic schwannoma : Meningioma
- Most common mediastinal germ cell tumor : Seminoma.
- Most common mediastinal mass in a child between the ages of 6 & 12 years old : Lymphoma
- Most common mediastinal neurogenic tumor : Schwannoma
- Most common mesenchymal origin neoplasm of GI tract : GIST
- Most common metabolic liver disease in children : Hepatic cirrhosis in homozygous alpha-1 Antitrypsin Deficiency
- Most common metastases to the spleen : Breast carcinoma
- Most common metastasis to the heart : Melanoma
- Most common metastatic cause of linitis plastica : Breast carcinoma
- Most common metatarsal to have a stress fracture : Second metatarsal.
- Most common missed type of breast cancer on mammography : Infiltrating/Invasive Lobular Carcinoma.
- Most common mitral valve abnormality in the Western world : Non-rheumatic mitral valve disease.
- Most common monodermal teratoma : Struma ovarii.
- Most common motor neuron disease : ALS.
- Most common MR imaging finding in DCIS : Non-masslike enhancement.
- Most common mycotic pneumonia in an AIDS patient : Cryptococcus.
- Most common natural outcome of the VSD : Spontaneous complete closure.
- Most common neonatal cyanotic congenital heart malformation : TGV
- Most common neonatal lesion of adrenal gland : Nontraumatic Adrenal Hemorrhage.
- Most common neoplasm of conus medullaris : Myxopapillary Ependymoma of Spinal Cord.
- Most common neoplasm of internal auditory canal / cerebellopontine angle : Vestibular Schwannoma.
- Most common neoplasm of the gastrointestinal tract in patients with NF1: Neurofibromas.
- Most common nerve to be involved in tarsal tunnel syndrome : Posterior tibial nerve.
- Most common nonepidemic meningoencephalitis in immunocompetent individuals in US : Herpes Encephalitis.
- Most common nonepithelial malignant bladder tumor : Leiomyosarcoma.
- Most common nonepithelial tumor in the colon : Lipoma.
- Most common nonepithelial tumor of the bladder : Leiomyoma.
- Most common nonglial primary tumors of the central nervous system : Meningiomas.
- Most common nonlymphoproliferative primary malignant tumor of the spine in adults : Chordoma.
- Most common nonlymphoproliferative primary malignant tumor of the spine in children : PNET.
- Most common nontraumatic cause of acute limp in a child : Toxic synovitis.
- Most common non-traumatic cause of facial nerve paralysis & hearing loss : CPA tumor.
- Most common odontogenic mass : Odontoma= odontogenic hamartomatous malformation.
- Most common of all alimentary tract duplications : Small Bowel Duplication Cyst.
- Most common of cerebral vascular malformation : DVA.
- Most common opportunistic infection in AIDS : Toxoplasmosis.
- Most common organism involved in pancreatic abscess : E. Coli.
- Most common organism of acute pyogenic meningitis in infants & children : N. meningitides.
- Most common origin of cystic artery : Right hepatic artery.
- Most common osteochondrodysplasia : Hereditary Multiple Exostoses
- Most common ovarian neoplasm : Dermoid aka dermoid cyst = Mature cystic teratoma
- Most common ovarian tumor-related morbidity : Bowel obstruction
- Most common pancreatic abnormality in adult pt’s with CF : Complete fatty replacement
- Most common paraneoplastic disease associated with thymoma : Myasthenia gravis
- Most common parasitic infection involving CNS in developing countries : Cysticercosis
- Most common parotid disease in children : Mumps parotitis.
- Most common pattern of bronchial arteries : Two left & one right bronchial artery
- Most common pattern of enhancement at DE MR cardiac imaging : Patchy midwall enhancement with multiple foci
- Most common pattern of hepatic involvement of secondary lymphoma : Diffuse infiltrative
- Most common pattern of spread in Gallbladder Carcinoma : Direct spread.
- Most common pediatric glioma : JPA
- Most common pediatric tumor causing isosexual precocious puberty in a girl : Granulosa cell tumor
- Most common phakomatoses : NF1
- Most common pineal tumor : Pineal Germinoma
- Most common predisposing cause to develop pneumothorax during percutaneous lung biopsy : COPD
- Most common predisposing disorder of secondary spontaneous pneumothorax : COPD
- Most common pregnancy-related mortality in the first trimester Ectopic pregnancy
- Most common presentation for idiopathic pulmonary fibrosis : Dyspnea
- Most common presentation in stuck twin syndrome : Monochorionic diamniotic
- Most common presentation of bronchoalveolar cell carcinoma (BAC) : Solitary pulmonary nodule.
- Most common presentation of GIST on cross sectional imaging : Cystic areas of necrosis.
- Most common presentation of mesoblastic nephroma : Palpable mass at birth.
- Most common presentation of neurocysticercosis : Seizures.
- Most common presenting symptom of Osler Weber Rendu : Hemoptysis.
- Most common primary benign mesenteric tumor : Desmoid.
- Most common primary brain tumor : GBM.
- Most common primary cardiac tumors in adults : Myxomas.
- Most common primary cerebellar mass in an adult : Hemangioblastoma
- Most common primary demyelinating disease : MS
- Most common primary female urethral malignancy : Squamous cell carcinoma
- Most common primary hepatic neoplasm in infants & children <5 years old : Hepatoblastoma
- Most common primary intraocular neoplasm in adult Caucasian : Uveal Melanoma
- Most common primary lung tumor under age 16 : Bronchial Adenoma
- Most common primary malignant rib tumor : Chondrosarcoma
- Most common primary malignant sacral tumor : Sacrococcygeal Chordoma
- Most common primary malignant soft-tissue tumor of late adult life : Soft-tissue MFH
- Most common primary neoplasm of the spleen : Cavernous hemangioma
- Most common primary neoplasms of the anterior superior mediastinum Thymomas.
- Most common primary posterior mediastinal neoplasms :Neurogenic tumors
- Most common primary tumor of the diaphragm : Lipoma
- Most common radiation-induced CNS tumor : Meningioma
- Most common reason for cardiac transplantation : Dilated cardiomyopathy
- Most common recognized CNS manifestation of VHL disease : Hemangioblastoma of CNS
- Most common relevant finding on cavogram for IVC filter placement : Circumaortic left renal vein.
- Most common renal fusion anomaly : Horseshoe kidney
- Most common renal mass in a 3 months old infant : Mesoblastic nephroma
- Most common respiratory cause of cold agglutinin production : Mycoplasma pneumonia
- Most common retinal infection in AIDS : Toxoplasmosis
- Most common right cardiophrenic angle mass : Epicardial fat-pad/lipoma
- Most common segment involved in tracheobronchial injury : Right lower lobe bronchus.
- Most common sex cord-stromal cell tumor : Ovarian Fibroma
- Most common sign of failing dialysis graft : Increased venous pressures
- Most common sign of tuberous sclerosis : Myoclonic seizures
- Most common single cause of breast lumps in females between 35 to 55 years of age : Breast cyst
- Most common site for an intracardiac papillary fibroelastoma : Aortic valve.
- Most common site for aneurysm in the chest : Descending thoracic aorta.
- Most common site for cardiac myxoma : Left atrium
- Most common site for intra cardiac thrombus formation : Atrial appendage.
- Most common site for optic melanoma metastases : Liver.
- Most common site for penetrating aortic ulcers : Descending thoracic aorta
- Most common site of abdominal involvement in Hodgkins disease : Spleen
- Most common site of aortic dissection : Prox. Desc. Thoracic aorta near ductus lig. attachment
- Most common site of biliary tract injury caused by blunt abdominal trauma : Gallbladder
- Most common site of monostotic fibrous dysplasia : Ribs
- Most common site of rupture of sinus of Valsalva aneurysm : RV followed by RA.
- Most common solid extracranial tumor of childhood : Neuroblastoma
- Most common spermatic cord tumor : Lipoma
- Most common spinal cord segment of lymphoma of spinal cord : Cervical
- Most common spinal cord tumor : Ependymoma
- Most common spinal location for cord astrocytoma : Thoracic
- Most common spinal location for cord ependymoma : Cervical
- Most common subcortical degenerative disease : Parkinson’s
- Most common subglottic soft-tissue upper resp. tract obstructing mass in neonates : Subglottic Hemangioma
- Most common submucosal tumor in colon : Lipoma
- Most common subtype of NHL involving the esophagus : Diffuse large B-cell lymphoma
- Most common subtype of renal cell carcinoma : Clear cell adenocarcinomas
- Most common suprasellar mass : Craniopharyngioma
- Most common syndromic islet cell tumor : Insulinoma
- Most common systemic allergic hypersensitivity-related acute small-vessel vasculitis in children : HSP
- Most common systemic fungal infection in immunocompromised patients : Candidiasis Of Liver
- Most common tarsal bone to get fractured : Calcaneus
- Most common tarsal coalition : Talocalcaneal
- Most common testicular tumor in a young boy : Yolk sac tumor
- Most common tibial plateau fractures : Lateral tibial plateau (Schatzker classification type I–III)
- Most common trigonal intraventricular mass in adulthood : Meningioma
- Most common tumor of adenohypophysis : Pituitary Adenoma
- Most common tumor of genitourinary tract : Metachronous TCC
- Most common tumor of the appendix : Carcinoid
- Most common tumor of the esophagus : Leiomyomas
- Most common tumor of the minor salivary glands : Adenoid Cystic Carcinoma
- Most common type of abdominal wall hernia : Inguinal hernia
- Most common type of ASD : Ostium secundum
- Most common type of brain hernaition : anterior / uncal transtentorial
- Most common type of brain herniation : Subfalcine herniation
- Most common type of C2 fractures : Type 2
- Most common type of cancer to arise from a thyroglossal duct cyst : Papillary carcinoma
- Most common type of cardiomyopathy : Dilated cardiomyopathy
- Most common type of choledochal cyst : fusiform dilatation of the extrahepatic duct Type 1c
- Most common type of congenital internal hernia : Left paraduodenal hernia
- Most common type of encephalocele in SE Asia: Sincipital Encephalocele
- Most common type of encephalocele in US : Occipital Encephalocele
- Most common type of endoleak in the abdominal aorta : Type II endoleak
- Most common type of endoleak in the thoracic aorta : Type I endoleak
- Most common type of fracture of the proximal 5th metatarsal bone : Peroneus brevis avulsion fracture.
- Most common type of gallbladder inflammation : Chronic cholecystitis
- Most common type of internal hernia : Postoperative, transmesenteric hernias.
- Most common type of intrapulmonary involvement of Hodgkins disease : Bronchovascular form.
- Most common type of liver abscess : Pyogenic Liver Abscess
- Most common type of lymphoma involving the head and neck region : Diffuse large B-cell lymphoma