Pheochromocytoma: diagnosis, localization, and treatment.

Pheochromocytoma is curable in 90% of cases, yet its diagnosis and localization are among the most challenging problems in clinical medicine. Although only 10% of these tumors are malignant, others may be lethal because of excessive circulating catecholamines. The clinical hallmark of pheochromocytoma is hypertension, but some patients are normotensive and may even be hypotensive.