Uncommon presentation of pheochromocytoma: case studies

Twelve patients with pheochromocytoma have shown unusual clinical and laboratory presentation. These include three patients with cardiac manifestations (sick sinus syndrome, obstructive cardiomyopathy and ischemic ECG changes). Two patients with gastrointestinal problems (acute abdomen due to ischemic bowel and constipation). One child with sudden blindness and one, non diabetic patient with polyuria. Laboratory findings included four patients with diabetes mellitus, four patients with hypercalcemia two of them with concomitant hyperreninemia and one patient with hypokalemia. Awareness of the illness leads to the discovery of unusual cases and even a most severely sick patient can make a complete recovery.