Q. A 45-year-old male is admitted to the hospital with complaints of chest pain, palpitations, and sweating. The patient reports experiencing episodes of chest pain for the past 6 months. The pain was sharp, non-radiating, and lasted for a few minutes. The patient also experienced palpitations and sweating during these episodes. The patient denies any shortness of breath, cough, or fever. The patient also reports that he was diagnosed with a pheochromocytoma three years ago and was on treatment. He has a history of hypertension, for which he is on medication. The patient also has a Marfanoid body habitus, which was first noted in his teenage years. He underwent aortic root replacement surgery for an aortic aneurysm 10 years ago. On physical examination, the patient is found to have a Marfanoid body habitus, with long fingers, arachnodactyly, and a high arched palate. His blood pressure is elevated at 160/100 mm Hg. The patient has a regular heart rate of 100/min. On cardiovascular examination, a grade 2/6 systolic ejection murmur is heard in the aortic area. His lungs are clear to auscultation. The patient’s abdomen is soft and non-tender. There are no palpable masses. You note multiple mucosal neuromas on his tongue. An electrocardiogram shows sinus tachycardia. Blood tests show elevated levels of catecholamines and metanephrines. A computed tomography scan of his chest and abdomen shows a 2.5 cm left adrenal mass. Based on the information you have at this point in time, which of the following is the most likely diagnosis?