This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine System, Subject name: Radiology
The diagnostic procedure not done in case of pheochromocytoma. 
Select and explain. 
A. CT scan, B. MRI, C. FNAC, D. MIBGscan
C: FNAC
Answer: C: FNAC 
Explanation: Ans. is 'c' i.e. FNAC 1551 "Percutaneous fine-needle aspiration of chromaffin tumors is contraindicated; indeed, pheochromocytoma should be considered before adrenal lesions are aspirated." -Harrison"Catastrophic hypertensive crisis and fatal cardiac arrhythmias can occur spontaneously or may be triggered by intravenous contrast dye or glucagon injection, needle biopsy of the mass, anesthesia, and surgical procedures." -