Primary calvarial meningioma.

Primary intraosseous meningioma of the skull is uncommon. We report upon a 50-year-old male patient who presented with a history of an expanding scalp mass over a few months, associated with headache. The mass was initially misdiagnosed as congenital encephalocele. It was observed for 2 months, but the headache increased in severity, and the mass increased in size. Imaging studies showed localized skull expansion at the vertex, and osteolysis of the inner and outer plates of the skull. There was brain tissue herniating through a defect in the inner plate. The patient underwent wide surgical excision, dural repair, and mesh cranioplasty, following which his headaches ceased. Histological examination showed WHO grade I meningioma.