Description
A 44-year-old man presented following a tonic-clonic seizure. Intracranial epidermoid cysts account for approximately 1% of primary intracranial tumours. They are benign slow growing tumours derived from ectodermal inclusions during neural tube closure. Typical presentation is between the ages of 20 and 40 years.
Epidermoid cysts are frequently found in the cerebellopontine angle, being the third commonest lesion at this site, following vestibular schwannomas and meningiomas. Lesions arising in the interhemispheric fissure are rare, accounting for approximately 4% of all intracranial locations.1
Clinical presentation is related to gradual mass effect and depends largely on the location of the tumour, the commonest symptoms being hearing loss, trigeminal neuralgia and headaches. Incidence of seizures is higher in patients with supratentorial lesions.2
On CT, epidermoids appear as lobulated hypoattenuating lesions that exert gradual mass effect (figure 1). MRI is the imaging modality of choice with...
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