The patient was submitted to surgery for the tumour resection.
MICROSCOPIC DESCRIPTION: Sections show a densely sclerotic tumour containing syncytial and spindled tumour cells with pale eosinophilic cytoplasm, oval nuclei with fine granular chromatin and inconspicuous nucleoli. No necrosis or mitoses are seen. No brain tissue is included. There is no evidence of atypia or malignancy.
Immunohistochemically tumour cells stain: EMA+, PgR+, CD99+, BCL2+ and CD34-. The Ki67 proliferation index is approximately 1%.
DIAGNOSIS: Falcine tumour: Meningioma, WHO grade I.