A Case of Abdominal Wall Schwannoma Resected with a Single Incision Laparoscopic Procedure

Abstract

Schwannomas, benign tumors that arise from the nerve sheath, rarely occur in the abdominal wall. A 76-year-old man was diagnosed with a tumor in the right upper abdominal wall and was referred to our hospital for further evaluation. Abdominal ultrasonography showed a well-defined circular tumor close to the liver, and abdominal computed tomography revealed a solitary oval tumor measuring 23 × 20 × 18 mm with slight contrast enhancement. The tumor diameter had been slowly increasing over the past 10 years ; hence, tumor excision was planned using a single incision laparoscopic procedure. The hemisphere-shaped tumor was located in the right upper abdominal wall and projected into the abdominal cavity. Hence, the tumor and surrounding peritoneum were resected. The tumor was a yellow-white smooth mass measuring 20 × 20 × 16 mm and was composed of spindle cells. The tumor cells stained positive for S-100 protein and negative for c-kit. Therefore, the tumor was diagnosed as a schwannoma. The patient currently has no signs of recurrence 1 year after the operation.