Sipple's syndrome with a malignant pheochromocytoma presenting as a pericardial effusion.

Sipple's syndrome is a multiple endocrinopathy usually involving the adrenal medulla and the thyroid. In the present case, a malignant pheochromocytoma metastasized to the pericardium and both lungs. The patient was known to have had a calcified right suprarenal mass for 8 years. He was admitted to the emergency room with symptomatology consistent with pericardial tamponade, but despite intensive management, he expired.