The patient went on to have resection of the presumed acoustic schwannoma, confirming the diagnosis. 

Histology

MICROSCOPIC DESCRIPTION: Paraffin sections show fragments of moderately hypercellular neurilemmoma (schwannoma). This is composed of both Antoni A and B type tissues. Well formed Verocay bodies are noted in Antoni A areas.

Moderate numbers of blood vessels with thickened hyalinised walls are also noted. Tumor cells show mild nuclear pleomorphism. No mitotic figures or areas of necrosis are identified.

FINAL DIAGNOSIS: Right acoustic nerve schwannoma