無症候性異所性褐色細胞腫の1例

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47歳女.無症候性の後腹膜腫瘤に対して24時間蓄尿による尿中カテコールアミン検索を行った.その結果,術前に無症候性異所性の褐色細胞腫と診断し手術を施行できた1例を経験したA 46-year-old female first presented to our clinic with a chief complaint of an abdominal mass. A computerized tomographic (CT) scan revealed a 6 cm retroperitoneal mass below the left kidney. Preoperative hormonal examinations showed elevation of catecholamines and vanillymandelic acid (VMA) in her 24-hour urine, although she had no hypertension. Therefore, the tumor was uneventfully removed and histologically diagnosed as pheochromocytoma. It is difficult to preoperatively diagnose normotensive extra-adrenal pheochromocytoma without any considerations of the possibilities. However, it may be hazardous to treat pheochromocytoma surgically without any preparations. In the present case, we emphasized the importance of preoperative accurate diagnosis of extra-adrenal pheochromocytoma and discussed briefly the clinical features in the literature.