The patient went on to have surgery.

Histology:

MICROSCOPIC DESCRIPTION: Sections show a spindle cell tumor demonstrating variable cellularity. Hypercellular (Antoni A) areas are composed of short fascicles of tumor cells with focal nuclear palisading (Verocay bodies). Hypocellular areas (Antoni B) show loose edematous and fibrillary stroma. Tumor cells contain bland wavy nuclei. There is prominent perivascular lymphocyte cuffing. There is focal nuclear atypia and hemosiderin laden macrophages; features consistent with ancient change. The tumor is present within densely sclerotic fibrous tissue. No brain tissue is seen. No necrosis or mitoses are seen. There is no evidence of malignancy.

FINAL DIAGNOSIS: Trigeminal schwannoma.