Case study 73 - intraosseous meningioma Intraosseous meningioma, also referred to as primary intraosseous meningioma, is a rare subtype of meningioma that accounts for less than 1% of all osseous tumors. Clinical presentation is usually due to mass effect, the manifestations of which will depend on the location. The calvaria and vertebral column are the most frequent sites. Presentations include: * palpable or visible bony mass * proptosis * cranial nerve / spinal cord compression * intracranial