Laparoscopically resected obturator nerve schwannoma: A case report.

Obturator nerve schwannomas are very rare. To date, only nine cases have been reported in the English-language literature; none of these were diagnosed preoperatively. A 68-year-old woman was admitted with left lower abdominal pain. CT and MRI revealed a mass 30 mm in diameter in the left obturator fossa, suggesting a retroperitoneal tumor. Because CT and MRI revealed clear continuity with the left obturator nerve, this case was diagnosed as an obturator nerve schwannoma. Tumor enucleation was performed by laparoscopy. On histopathological examination, this case was diagnosed as a benign obturator nerve schwannoma. Postoperatively, the patient developed weakness of the adductor muscle but recovered within 6 months with rehabilitation therapy. Preoperative diagnosis of obturator nerve schwannomas is quite difficult, but careful inspection of CT and MRI is important to identify the original nerve of schwannoma preoperatively. Accordingly, laparoscopic resection is a good treatment option.