Abstract

Introduction: Int primary intraosseous meningiomas are rare extradural tumors. They are typically slow-growing, painless, and asymptomatic until they cause a mass effect. We report the case of a 71-year-old woman presenting with an intraosseous meningioma located in the right parietal bone, a rare entity that often poses a diagnostic challenge.
Case Report: We report the case of a 71-year-old woman who presented with a right parietal swelling that progressively increased in size over 2-3 years without associated clinical signs. The patient benefited from a full radiological workup returning in favor of a right parietal intraosseous lytic meningioma. The lesion had a preoperative diagnosis of osteoid osteoma of the right parietal bone and the tumor was completely excised. Histopathological examination confirmed the diagnosis of an intraosseous meningothelial meningioma. Primary intraosseous meningiomas should be considered, especially when they can exhibit radiological features that may be indistinguishable from cranial osteoid osteomas. Key radiological diagnostic features are presented.
Conclusion: Intraosseous meningiomas are rare lesions that originate in the skull and represent the most common type of extradural meningioma; the lesions are often asymptomatic but can cause proptosis and neurologic symptoms depending on their size and location. Intraosseous meningiomas likely originate from entrapment of arachnoid cells within the bone. The treatment of choice is surgical resection, which is potentially curative.

Keywords

Intraosseous meningioma, parietal bone, surgical resection, arachnoid cells