[Case of bladder pheochromocytoma with familial clustering].

We report herein a rare female case of bladder pheochromocytoma with familial clustering. Her mother had received an operation for bladder pheochromocytoma. When the present case was 20 years of age, body weight loss and fever appeared. Thereafter, nausea, vomiting and palpitation occurred especially at urination, and hypertension and tachycardia emerged. She was referred to our hospital for a further check up of hypertension at the age of 28 years. Her blood pressure was 176/130 mmHg, and pulse rate, 103/min. Hemorrhage and hard exudate were observed at the optic fundi. Twenty-four-hour ambulatory blood pressure monitoring disclosed that her hypertension was characterized by non-dipper type features and transient increases in both blood pressure and pulse rate occurring, especially at urination. Plasma noradrenalin level (14,399 pg/mL)was remarkably elevated, although the plasma adrenalin level (52 pg/mL) was within the normal limits. Computed tomography (CT) showed a mass lesion (7 cm in diameter) with central necrosis in the urinary bladder. 123I-MIBG showed strong uptake in the mass detected by CT. Venous blood sampling disclosed that the plasma noradrenalin concentration was highest at the lower level of the inferior vena cava. Therefore, a diagnosis of bladder pheochromocytoma with familial clustering was made and the pheochromocytoma was surgically removed.