The patient went on to have a resection.

Histology

Paraffin sections show a moderately hypercellular neurilemmoma (schwannoma) composed of both Antoni-A and B type tissues. Well-formed Verocay bodies are noted in Antoni A areas. Tumor cells show mild nuclear and cellular pleomorphism. No mitotic figures, densely hypercellular areas or areas of necrosis are identified.

FINAL DIAGNOSIS: right S2 nerve root schwannoma.