Background: Trichilemmal cyst (TC) a rare tumour originating from the outer root sheath of the hair follicle particularly in the scalp has never been reported to involve the skull base. Here a case of TC extensively involving the skull base is presented. The neuro-imaging, operative, and pathological features are described. Possible histogenesis is also discussed.
Method: The clinical, radiological, operative, and pathological features of a TC involving the temporal-infratemporal fossae, orbit, paranasal sinuses, and the clivus is described.
Findings: Multilocular cysts full of keratinized material were found. Histopathological findings were consistent with those for a typical cutaneous TC.
Conclusion: TC of the variety found in the skin may involve the skull base extensively where it shows the typical histopathological features.
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