Plexiform neurofibroma of the pelvis in neurofibromatosis: CT findings.

Three cases of intrapelvic plexiform neurofibromas are presented in patients with neurofibromatosis. In all three cases computed tomography demonstrated widespread sheets of nodular tissue lying in an extraperitoneal location in front of the sacrum or extending along the pelvic sidewalls . Symptomatology in these patients related to compression of either nerve roots or adjacent vessels. It is important to differentiate these lesions from pelvic lymphadenopathy to prevent a mistaken diagnosis of malignant disease.