Abstract
Background: With a prevalence rate of 0,3 to 0,95% pheochromocytomas are rare neoplasms that are predominantly located in the abdomen (95%), usually within the adrenal glands (85-90%) They can occur at any age but have a peak incidence bethween the fourth and fifth decades of life, and have no gender predilection. Most present as single tumors (85-90%) and have a malignancy rate of 12 to 29%. They can present as sporadic tumors or be associated with familiar syndromes like von Hippel Lindau disease, MEN II, von Recklinhausen´s disease, Sturge Weber syndrome, tuberous sclerosis and pheochromocytoma/paraganglyoma syndrome.
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