For some people, imaging studies, such as CT scans, done for another reason, may catch a pheochromocytoma before it produces symptoms.

CNN: Pheochromocytoma

You may not have signs or symptoms if your pheochromocytoma is associated with a genetic condition, such as multiple endocrine neoplasia, type II (MEN II), because it's likely to be found on a scan before symptoms start.

CNN: Pheochromocytoma