Percentage of pheochromocytoma that are bilateral is:
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.
<1%
1-5%
10%
25%