Medicine Endocrinology 3e25bece Investigation of choice in pheochromocytomais- A CTscan B Urinary catecholamines C MlBGscan D Urinary calcium measurement High-Yield Explanation Pheochromocytoma synthesize and store catecholamines. Elevated plasma and urinary levels of catecholamines are impoant for diagnosis Ref -( Harrison 17 pg 2270)