![]() ![]() ![]() One estimate suggests about only 8 people per 1 million people have pheochromocytoma, but this estimate may be low. Most cases of pheochromocytoma occur in people aged 30 to 50 years old. It is unknown how many people have pheochromocytoma because many people are never diagnosed. Only about 10% of pheochromocytomas spread to other parts of the body. Most pheochromocytomas are benign, which means they are not cancer and do not spread to other parts of the body. About 15-20% of pheochromocytomas grow outside of this area and are called extra-adrenal pheochromocytomas or paragangliomas. ![]() About 80-85% of pheochromocytomas grow in the inner layer of the adrenal gland, called the adrenal medulla. The adrenal glands are small organs located in the upper region of the abdomen on top of the kidneys. These cells produce hormones needed for the body and are found in the adrenal glands. Pheochromocytoma is a type of neuroendocrine tumor that grows from cells called chromaffin cells. You can help speed up the development of new treatments by giving researchers the tools they need. ![]()
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