MRCP2-1406
A 45-year-old man presents to the Hypertension Clinic with a history of headaches and dizziness over the past four months. He also reports experiencing central abdominal discomfort and some recent weight loss, possibly due to a low-fat diet. On examination, his BP is 154/92 mmHg, and there is noticeable swelling in his thyroid. His bone profile shows a corrected calcium level of 2.76 mmol/l, and his GP has ruled out diabetes with a normal oral glucose tolerance test. What is the most likely cause of his hypertension?