Surgery: large left kidney tumor (weight 1.3 kg). No ascites. No peritoneal metastases. Small puncture in the tumor after resection but with no spillage into the abdomen. No tumor in the renal vein.

Pathology: no blastemal elements seen. The mass is confined to the kidney. The ureteric and renal vein margins are free of tumor.

Provisional diagnosis: cystic nephroma.

Thanks to Dr. Tamadur Mahasneh. Consultant Pathologist. King Hussain Cancer Center. Amman, Jordan.