Retroperitoneal malignant schwannoma: a case report.

Malignant schwannomas are primary nerve sheath tumors that usually arise from peripheral nerves and only rarely occur within the retroperitoneum. Only 13 instances of this neoplasm occurring in such an anatomic location have been reported in the English literature, and none have been described previously in children. The present report details a case of a retroperitoneal malignant schwannoma in a 14-yr-old child.