A 43-year-old man with a history of hypercalcemia and bitemporal hemianopsia presents to the emergency department with muscle weakness, lethargy, and watery diarrhea. He reports brief episodes of complete paralysis in his lower extremities. The pH of the patient’s nasogastric suction fluid is increased. An abdominal mass is noted on CT scan. The patient’s family history is positive for numerous endocrine organ abnormalities. Which of the following is the most likely cause of this patient’s symptoms?
(A) Gastrinoma
(B) Insulinoma
© Medullary thyroid carcinoma
(D) Pancreatic adenocarcinoma
(E) VIPoma