Extradural Dermoid Cyst of the Cerebellar Convexity in an Elderly Patient: A Rare Case

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Dermoid cysts (DCs) are rare tumours originating from ectodermal and mesodermal tissues.They usually occur in the midline, especially in the posterior fossa.In this study, we describe an interesting case of a 73year-old patient who presented with mild headaches, an imbalanced gait, and a slow, progressive hearing loss in the left ear.A brain CT scan showed a hypodense left cerebellar convexity extra-axial mass, containing some calcifications and causing bone erosion.On MRI, this tumour had a low T1 signal, a heterogeneous T2 signal, and a heterogeneous signal on diffusion-weighted images, with discrete peripheral enhancement.The patient was operated on through a left retrosigmoid approach, during which a yellowish, soft, waxy extra-dural mass was removed.Post-operative follow-up was uneventful.Histological study found stratified keratinized tissue, and tumour walls were covered with Malpighian epithelium.These tumours usually have slow, progressive symptoms depending on location; however, severe, life-threatening presentations are possible.CT scan and MRI are useful to establish the diagnosis of dermoid cysts.Maximal safe resection is the treatment of choice.

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