A case of renal cell carcinoma associated with ossification

: 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.