A Rare Orbital Trichilemmal Cyst: A Case Report.

This article presents the rare occurrence of a trichilemmal cyst in the orbit of a 69-year-old female patient, who presented with a headache of acute onset and relative unilateral proptosis of the left eye. CT scan showed a cystic, well-demarcated, round hypodense lesion, with spotted calcification. Surgery was performed for the extraction and analysis of the lesion, which showed typical histological findings of a trichilemmal tumor. This case represents the only one reported in the literature, to the best of the authors' knowledge. An atypical localization for this kind of tumor that usually arises from zones with an abundance of hair follicles.