腎細胞癌を合併した馬蹄鉄腎の1例

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65歳男,馬蹄鉄腎に合併した腎細胞癌としては本邦第19例目である.馬蹄鉄腎に合併する腫瘍は正常腎にくらべ腎細胞癌が相対的に少なく,腎芽細胞腫,腎盂腫瘍の相対頻度が高いという注目すべき点があるA 65-year-old man with pyuria visited our hospital. Physical examination had revealed a mass in the left upper quadrant of the abdomen. Intravenous pyelogram, ultrasonogram, computerized tomography and selective renal arteriogram suggested a hypervascular renal cell carcinoma on the left side of the horseshoe kidney. A left radical nephrectomy with division of the isthmus was performed. The pathological diagnosis indicated renal cell carcinoma consisting of clear cell type without invasion of the capsule or renal pelvis. Treatment with alpha-interferon was started and has continued for six months with no evidence of recurrence. Only 35 cases of horseshoe kidney with a renal tumor have been reported in the Japanese literature. Among them, adenocarcinoma was present in 54.3% of the cases, renal pelvic tumor in 17.1%, and nephroblastoma in 14.3%. While adenocarcinoma in horseshoe kidney is seen less often than normal kidney, there is an increased incidence of both renal pelvic tumor and nephroblastoma.