<prompt> All are true about pheochromocytoma except?Urinary V.M.A is most specificParaganglioma occurs at skull base10 extra adrenalOrgan of Zuckerkandl is most common extra adrenal site  <response>: Paraganglioma is a term used to describe catecholamine producing tumors in the skull base and neck. The classic rule of tens is valid for pheochromocytoma. Organ of Zuckerkandl is a collection of chromaffin cells near the origin of the inferior mesenteric aery or near the aoic bifurcation. It is the most common extra-adrenal site of pheochromocytoma. Urinary VMA is used for diagnosis of neuroblastoma and not pheochromocytoma. The most sensitive test for pheochromocytoma is urinary fractionated metanephrine 