Extraosseous Ectopic Meningioma on Temporoparietal Region Mimicking a Soft Tissue Tumour: A Case Report

Abstract

Ectopic meningiomas are very rare tumour entities that account for approximately 1-2% of all meningiomas and appear extracranially mostly in the head and neck region. Usually they create diagnostic confusion in an ectopic site with other soft tissue neoplasms, mostly peripheral nerve sheath tumors, myogenic tumours and vascular tumours, more so, with morphological variants like fibroblastic, angiomatous, etc. that may not show the meningothelial cells conspicuously. Here authors report one such case of a 55-year-old female, presenting with a slowly growing non tender left temporal mass since childhood that was thought to be a myogenic tumour on Computed Tomography (CT) scan but on microscopy was a transitional meningioma with mixed fibroblastic and meningothelial pattern. Hence, ectopic meningioma is one of the imperative diagnosis that a pathologist should keep in mind while dealing with soft tissue neoplasms of the head and neck region.

Keywords

• calvarial meningioma
• meningeal rests
• epithelial membrane antigen
• intranuclear inclusions