The patient went on to have a resection, confirming the diagnosis. 

Histology

MICROSCOPIC DESCRIPTION:

The sections show a moderately cellular meningioma with attached dura. The tumor forms whorls. No sheeting arrangement is seen. The tumor cells have ovoid nuclei with no nuclear pleomorphism. Mitoses are inconspicuous.  There is no necrosis. A small amount of brain parenchyma is seen and there is no evidence of brain invasion. No evidence of atypical or malignant change is identified.

FINAL DIAGNOSIS: meningioma (WHO Grade I).