A Rare Case of Extracranial Meningioma of the Temporal Bone

Abstract

A 54-year-old female patient came with complaints of progressively increasing swelling over the forehead and temporal region on the right side for two years. The swelling was painless and was associated with proptosis. The swelling was not associated with loss of vision. A plain computed tomography scan of the brain revealed a large predominantly extracranial soft tissue density lesion approximately measuring 5.2×4.1×5.7 cm, which was located in the right temporal region and was seen to be extending into the infratemporal fossa [Table/Fig-1]. The intracranial extension of the tumor was noted along the anterior aspect of the temporal bone on the right side. The lesion was also seen to be extending into the right orbital space pushing the lateral rectus muscle and optic nerve medially. The lesion eroded the temporal bone, greater wing of the sphenoid bone, and lateral wall of orbit on the right-side [Table/Fig-2]. Magnetic Resonance Imaging (MRI) brain with contrast revealed the same extensions as that of Computed Tomography (CT). The lesion involved the temporalis muscle and showed heterogenous enhancement in postcontrast study [Table/Fig-3]. There was no evidence of local lymphadenopathy. The patient underwent near total excision of the lesion and the tissue was sent for histopathological examination. The histopathologic features revealed meningothelial meningioma arising from the temporal bone with a predominant extracranial extension which was suggestive of extracranial meningothelial meningioma [Table/Fig-4].

Keywords

• computed tomography
• lymphadenopathy
• magnetic resonance imaging
• meningothelial