<prompt> A boy presented with hypeension is found to have pheochromocytoma. All of the following are true about pheochromocytoma, EXCEPT:Benign in natureMalignant tumorSecretes hormonesHypeension is seen  <response>: All of the given options are true about pheochromocytoma. The primary clinical symptoms of pheochromocytoma relate to the excess catecholamine, and the primary symptom associated with this tumor is hypeension. Pheochromocytomas may be intraadrenal, extraadrenal, benign, or malignant. But, only 10 Pheochromocytoma are malignant and hence it is the best possible answer. The classic P signs and symptoms of pheochromocytoma include paroxysms, perspiration, pallor, pressure hypeension, palpitations tachycardia, and pounding headaches. Note - A classic teaching point for describing the natural history of pheochromocytomas is The Rule of Tens. This rule states that 10 of pheochromocytomas are malignant, 10 are bilateral, 10 are familial, and 10 are extra-adrenal. Ref: DeVita, Hellman, and Rosenbergs Cancer, Volume 1 By Vincent T DeVita, Jr M.D., Theodore S. Lawrence, Steven A Rosenberg, M.D., 2008, Page 1698; Harrisons Internal Medicine, Chapter 337. Pheochromocytoma Table 337-1. 