Trichilemmal cyst involving the skull base.
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.


METHODS
The clinical, radiological, operative, and pathological features of a TC involving the temporal-infratemporal fossae, orbit, paranasal sinuses, and the clivus is described.


RESULTS
Multilocular cysts full of keratinized material were found. Histopathological findings were consistent with those for a typical cutaneous TC.


CONCLUSIONS
TC of the variety found in the skin may involve the skull base extensively where it shows the typical histopathological features.
El-Bahy
K
K
Department of Neurosurgery, Ain Shams University, Cairo, Egypt. Khaledbahy@yahoo.com
Ishak
E
E
D000368:Aged; D018859:Hair Follicle; D006801:Humans; D008297:Male; D018295:Neoplasms, Basal Cell / Q000473:pathology* / Q000601:surgery; D019292:Skull Base Neoplasms / Q000473:pathology* / Q000601:surgery