A case of renal angiomyolipoma with marked cystic degeneration and pseudoaneurysm

摘要

A 59-year-old woman consulted our hospital for a left renal mass which she had been aware of for 4 years. The tumor was in the lower portion of the left kidney. It was a cystic tumor whose wall was enhanced on computed tomography and magnetic resonance imaging. The lesion 3.0 cm in diameter, which was enhanced equally to the aorta, was found in a part of the wall. It was thought to be a pseudoaneurysm by renal angiography. We suspected a cystic renal cell carcinoma because of the plural feeding arteries and tumor staining, and performed left total nephrectomy. Pathological diagnosis was angiomyolipoma with few fat components. To our knowledge only 3 previous cases of renal angiomyolipoma with marked cystic degeneration have been reported in Japan. In all 3 cases, it was difficult in preoperative diagnosis to distinguish angiomyolipoma with cystic degeneration from cystic renal cell carcinoma complicated cyst. Moreover, this is the first reported case of renal angiomyolipoma with marked cystic degeneration and pseudoaneurysm.