Fig. 1. A 62-year-old woman with a category II cystic lesion (hyperdense cyst) in the left kidney. The patient underwent laparoscopic partial nephrectomy. The final pathological diagnosis is renal cell carcinoma (papillary renal cell carcinoma). (A) Unenhanced computed tomography (CT) scan shows small, smooth-walled, high-density left renal cyst. (B) CT scan after administration of contrast material shows no enhancement of the cyst.
