This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Radiology
[{'content': 'Which one of the following imaging modalities is most sensitive for localization of extra adrenal pheochromocytoma? \nSelect and explain. \nA. USG, B. DOPA-PET, C. MRI, D. MIBG scan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. DOPA-PETPheochromocytoma* MRI has been the primary method of diagnosis for adrenal pheochromocytoma which shows light bulb appearance on a T2 weighted MRI. MIBG scanning can play a complementary role in evaluating intra adrenal pheochromocytoma.* It is 80-90% sensitive for adrenal one. MIBG scintigraphy is extremely valuable in imaging of extra adrenal and recurrent pheochromocytoma. MIBG is a precursor of catecholamines and therefore, is actively taken up in catecholamines producing tissues, recently introduction of F-DOPA PET has markedly increased the diagnostic accuracy of imaging investigation for localization of both intra as well as extra adrenal pheochromocytoma.', 'role': 'assistant'}]