A 26-year-old man with a history of kidney stones presents with 1 week of severe burning epigastric pain. He also notes several days of diarrhea and n

[Kathryn]

#may2020mccqe1

A 26-year-old man with a history of kidney stones presents with 1 week of severe burning epigastric pain. He also notes several days of diarrhea and nausea but denies emesis or fever. His family history is remarkable for a paternal uncle with pancreatic cancer. His temperature is 37°C (98.6°F), heart rate is 88/min, respiratory rate is 16/min, and blood pressure is 125/85 mm Hg. Abdominal examination is significant for tenderness in the mid-epigastrium. Upper endoscopy reveals a 1-cm ulceration in the first part of the duodenum. This is the third episode of confirmed peptic ulcers in this patient. Laboratory studies show:
Na+: 140 mEq/L
K+: 4.9 mEq/L
Cl−: 105 mEq/L
HCO3−: 25 mEq/L 2+ 3
Ca2+ : 12.0 mg/dL
PO4: 1.4 mg/dL
Mg2+: 2.0 mg/dL
Blood urea nitrogen: 10 mg/dL
Creatinine: 1.0 mg/dL
Glucose: 87 mg/dL
Which of the following is most likely to be found in this patient?
(A) Medullary thyroid carcinoma
(B) Papillary thyroid carcinoma
(C) Pheochromocytoma
(D) Prolactinoma
(E) Squamous cell lung cancer