Intratarsal Keratinous Cyst at the Eyelid Margin: A Case Report.

An uncommon case of an intratarsal keratinous cyst at the lid margin is described in a 73-year-old Asian man using long-term antiglaucoma eye drops. There was no history of trauma or surgery of the upper eyelid. A yellow solid mass attached to the tarsal plate had been located there for about 3 years. It imitated a sebaceous gland carcinoma or steatocystoma simplex. Excision biopsy showed cystic formation and leaked yellow creamy substance without hair. Histopathological and immunological findings helped make the diagnosis of an intratarsal keratinous cyst. To the best of the authors' knowledge, this is the first case report of an intratarsal keratinous cyst at the lid margin.