Pheochromocytoma is a rare
Chromaffin tumors; Paraganglionoma
Causes, incidence, and risk factors
Pheochromocytoma may occur as a single tumor or as more than one growth. It usually develops in the center (medulla) of one or both
Very few pheochromocytomas are cancerous.
The tumors may occur at any age, but they are most common from early to mid-adulthood.