Proliferating Trichilemmal Cyst of the Eyelid

Purpose To report a case of proliferating trichilemmal cyst in a 55-year-old woman. Design Observational case report. Methods A 55-year-old woman sought treatment for a mass in the right upper eyelid. The lesion was excised twice previously, and recurred. The mass was reexcised and examined histopathologically. Results Light microscopy showed a cystic lesion lined by stratified squamous epithelium with a compact layer of eosinophilic keratin without granular cell layer. There was no atypia, mitosis, or stromal invasion. Conclusions Although proliferating trichilemmal cyst shows benign histopathologic features, clinical manifestations may mimic those of more aggressive tumors with local recurrences or distant metastasis. Wide excision of the lesion and close long-term follow-up is recommended.