多房性嚢胞状腎細胞癌の1例

RENAL CELL CARCINOMA SHOWING MARKED MULTILOCULAR CYSTIC CHANGES: A CASE REPORT

　症例は右側腹部疝痛発作を主訴として来院した56歳の男性。右尿管結石と診断したが，腎部超音波検査で偶然に左腎に異常な嚢胞状腫瘤が認められた。CTスキャン・腎動脈造影などより腎細胞癌を疑い，手術を行ったところ，病理組織学的に多房性嚢胞形成が著明な腎細胞癌と診断された。本腫瘍は比較的稀であり，特に多房性腎嚢胞との鑑別が重要である。

When a multilocular cystic renal mass is observed in a middle-advanced age patients, it is clinically difficult to differentiate a benign multilocular renal cyst from renal cell carcinoma with multilocular cystic changes.

We encountered a 56-year-old male in whom a multilocular cystic mass was incidentally detected during treatment for right ureteral stone, and was demonstrated to be a renal cell carcinoma with marked cystic changes.