馬蹄鉄腎に発生した腎細胞癌の1例

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50歳男.腫瘍は左腎下極に限局しており,リンパ節転移や血管内浸潤は認めなかった.左上極に結石を伴っていたため手術は左半腎摘除術を施行した.術後1年を経過し再発,転移は認めていないA-50-year-old patient visited our hospital to have further examination for left renal mass. Drip infusion pyelography revealed a cluster of calculi in the upper pole of the left kidney. Computed tomography and magnetic resonance imaging revealed a heterogeneous mass on the left side of a horseshoe kidney. Left nephrectomy was performed through an abdominal transperitoneal approach. An operation for dividing isthmus was simultaneously done using a microwave tissue coagulator. Histopathological findings showed grade 1 > 2, pT1aN0M0, clear cell subtype, renal cell carcinoma. Convalescence was uneventful and the patient was free of tumor at one year postoperatively.