Pheochromocytoma with fever and iron deficiency anemia.

Pheochromocytoma is a rare neuroendocrine tumor of the adrenal gland. With its heterogeneous clinical presentation, its diagnosis is frequently elusive. This case focuses on an unusual presentation of pheochromocytoma without the typical picture of hypertension, palpitations, and headaches. A few similar reports suggest a role of interleukin-6 production by the tumor in this presentation, indicating that not all symptoms and signs of the disease are due to catecholamine secretion.