Axial (A) and coronal (B) magnetic resonance images show large tumor along the sciatic nerve in a patient with neurofibromatosis. Biopsy confirmed this to be a neurofibroma. C, After incising epineurium, nerve fibers were bluntly dissected away from tumor. D, Tumor has been removed with preservation of tibial and peroneal divisions of sciatic nerve. E, Photograph of specimen.