A 43-year-old man presented with left lower abdominal pain which had lasted for one month. He had a history of renal tuberculosis and a left ureteral stone. Physical examination was unremarkable. US showed a mass, about 2 cm in size and slightly hyperechoic to renal cortex, in the lower pole of the left kidney. It had poor margin. Unehanced CT scan showed a lobulated mass with higher attenuation than the renal parenchyma; after the intravenous administration of contrast material, the mass did not show significant enhancement (Fig. 3A). Renal cell carcinoma was diagnosed, and the patient was referred for left nephrectomy. Pathologic analysis of the specimen showed a hemorrhagic lesion in the corticome-dullary junction of the lower pole (Fig. 3B). Microscopical-ly, the hemorrhagic area was seen to composed of capillary-sized vessels, and there was no evidence of malignancy.