Background: Intraosseous meningiomas are extradural meningiomas, which are rare lesions arising in the skull. They are likely to originate from intraosseous entrapment of arachnoid cells. They are often asymptomatic, but may cause symptoms depending on the location and size. Surgical resection is usually used to treat patients. Radiation therapy and chemotherapy may be needed as an adjuvant therapy in tumors, which cannot be completely resected.
Clinical case: we report a case of a 42–year old male patient presenting with painless, gradually progressing swelling over the right frontoparietal region for 4 years. CT scan of the brain with contrast revealed an expansive osteoblastic lesion with lobulated outlines involving right frontoparietal bone, with obliteration of diploic space, and with associated enhancing diffuse extra-cranial soft tissue component, also with a thin extra-axial soft tissue component suggestive of an osteoblastic intraosseous meningioma. Surgical resection was performed. Biopsy was confirmatory.
Conclusion: intraosseous meningiomas are osteoblastic or osteolytic. Osteoblastic lesions mimic fibrous dysplasia. They are extradural meningiomas, which are rare lesions arising in the skull.
Keywords: Meningioma, intraosseous, extradural, osteoblastic, calvarial.