多尿を主症状とした褐色細胞腫

A CASE OF PHEOCHROMOCYTOMA WITH POLYURIA

　褐色細胞腫は典型的臨床症状から，その存在が疑われやすいが，今回多尿を主症状とする1例を経験した。患者は10年来多尿を自覚するも放置，健康診断にて糖尿病を疑われ，精査中左副腎腫瘍が判明した。10.5×9.0×5、0cm,340gの腫瘍摘出後，血中・尿中ノルアドレナリン値，尿量は正常になつた。

A 39-year-old man was hospitalized because of polyuria (over 6000 ml/day) of 10 years' duration. The blood pressure was 136/90 mmHg. Serum and urine noradrenaline levels were slightly elevated, but he had no typical symptoms of pheochromocytoma, like headache or palpitation. Urogram and CT revealed the huge left retroperitoneal mass, which showed extreme accumulation of ¹³¹I-metaiodobenzylg-uanidine (MIBG). The left adrenal encapsulated tumor (10. 5 × 9. 0 × 5.0 cm, 340 g) was removed and was revealed typical pheochromocytoma histopathologically.