Clear cell hidradenocarcinoma of the eyelid: a case report with a review of the literature.

Clear cell hidradenocarcinomas are extremely rare neoplasms, with very few well-documented cases reported in the literature. The most common sites are the head and neck regions. These tumors are histologically malignant but are not always aggressive. They are known for recurrence and may metastasize widely. Treatment is wide local resection. We report on a case of clear cell hidradenocarcinoma occurring over the eyelid together with a review of the literature.