The patient went on to have surgical excision of the mass.


MICROSCOPIC DESCRIPTION: The sections show a moderately cellular meningioma with attached dura.  The tumour comprises whorls and fascicles with psammoma bodies. The tumour cells have ovoid nuclei with no significant nuclear pleomorphism. Up to 2 mitoses per 10 hpf are identified.  There is a single small focus of necrosis.  There is no evidence of tumour invasion into small amount of attached brain parenchyma. 

The tumour cells show focal positivity for PgR. The Ki-67 index is approximately 1%. 

DIAGNOSIS: Psammomatous meningioma (WHO Grade I).