Laparoscopic view during surgery. (A) The tumor was detected in the retroperitoneal space between LGA and CHA. (B) The tumor was strongly adhered to LGA and CHA. (C) We could observe network of peripheral nerve around the CHA entering the tumor. (D) After resection of the tumor from retroperitoneal space. LGA, left gastric artery; CHA, common hepatic artery; SA, splenic artery.