Primary extradural meningioma arising from the calvarium

Abstract

Meningiomas are the most common intracranial tumours. Meningiomas arising at other locations are termed primary extradural meningiomas (EDM) and are rare. Here we report a case of EDM arising from the calvarium – a primary calvarial meningioma (PCM).

Hard scalp lump with headache

“…Primary EDMs have an incidence of less than 2 % of all meningiomas [3][4][5][6][7] and have been reported to arise from the scalp tissue, orbit, paranasal sinuses, nasopharynx, salivary glands, neck, skin, lung, mediastinum, adrenal and paraspinal regions, and even the fingers [3][4][5]. Primary EDMs have a slight female preponderance (1:1.4) with a bimodal age distribution, the first peak being in the 2nd decade and the next in the 5th to 7th decades [1,[3][4][5].…”

“…Primary EDMs have a slight female preponderance (1:1.4) with a bimodal age distribution, the first peak being in the 2nd decade and the next in the 5th to 7th decades [1,[3][4][5].…”

“…The commonest presenting feature of ICM is a gradually expanding painless mass [1,[3][4][5]7], usually benign and slow-growing. However, it is reported that ICMs are more prone to developing malignant changes than intracranial meningiomas, with a reported incidence of 11 % and 2 % respectively [3,5].…”

“…However, MRI provides better anatomical delineation and evaluation of the soft tissue component. The most common MRI appearance is diffuse hypointense signal in the expansile lesion on T1 sequences and variable heterogeneous signal on T2 sequences [4,5].…”

“…If only subtotal resection is possible because of the involvement of critical structures within the orbit, paranasal sinuses, or skull base, then the residual tumor should be followed radiologically. Adjuvant radiation therapy is recommended in patients whose residual lesions are symptomatic and/or show evidence of malignancy [1,2,4,10].…”