A, T1-weighted coronal magnetic resonance imaging shows a 3 cm fusiform mass along peroneal nerve. B, Contrast-enhanced, fat-suppressed axial image shows a high signal at the periphery of the lesion with a low signal in the center. The patient complained of pain radiating to the dorsum of the foot whenever she “bumped” the mass. All of these findings are typical of benign nerve sheath tumor. C, Intraoperative photograph shows neurilemmoma of the peroneal nerve. D, After incising the epineurium, the tumor was easily separated from the nerve fibers using blunt dissection.