Percentage of pheochromocytoma that are bilateral is:: (A) <1%, (B) 1-5%, (C) 10%, (D) 25%
Answer is C. Pheochromocytomas often are called the 10 percent tumor because 10% are bilateral, 10% are malignant, 10% occur in pediatric patients, 10% are extra-adrenal, and 10% are familial. Ref: Schwaz's principle of surgery 9th edition, chapter 38.