骨形成を伴った腎細胞癌の1例

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左腰痛を訴えた40歳女で,単純X線写真で左腎下極に直径7.5cmの石灰化像を認め,CT及び血管撮影で直径10cmの血管過小腫瘤を認めた.根治的左腎摘除を行った.組織学的に著明な間質石灰化を伴う淡明型,pT2N0M0の腎細胞癌であった.術後42ヵ月の現在,再発を認めず生存中であるA 40-year-old woman presented with left lumbar pain. A plain abdominal roentgenogram showed patchy calcifications dispersed in a diameter of 7.5 cm at the lower pole of the left kidney. Computed tomography and angiography revealed a hypovascular tumor 10 cm in diameter. A left radical nephrectomy was performed. Histopathological diagnosis was renal cell carcinoma, clear cell subtype, pT2N0M0, accompanied with marked stromal calcification. The patient remains free of recurrence 42 months postoperatively. This is the 26th case reported in the Japanese literature.