Abstract
A 68-year-old woman was seen at the hospital, due to a 9-cm-diameter, right lower abdominal mass. The mass was palpable in the right lower abdomen, when the mass was pressed the patient felt pain radiating into the front of the right thigh. Abdominal ultrasonography, CT scan, and MRI showed the well-defined tumor in the pelvis. A preoperative diagnosis of retroperitoneal neurilemmoma arising from the femoral nerve was made. At laparotomy, the tumor was found to be adjacent to the iliopsoas muscle, it partially adhered to and ventrally displaced the femoral nerve. The tumor was carefully removed from the femoral nerve. After surgery, the patient complained of a slight sensory disturbance in the front of the right thigh ; this symptom disappeared after several days. On pathology, a benign neurilemmoma was diagnosed. Excision of a neurilemmoma arising from the femoral nerve can result in severe damage. Therefore, if there are no pre- and intraoperative malignant findings, the nerve should be preserved.
