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Rapidly growing extraocular sebaceous carcinoma occurring during pregnancy: a case report.

Sebaceous carcinoma is a very rare, aggressive, malignant tumor derived from the adnexal epithelium of sebaceous glands. It is traditionally classified into two groups: tumors arising from the ocular adnexa and those arising in extra-ocular sites. Despite the widespread anatomic distribution of sebaceous glands, extraocular sebaceous carcinoma is very rare, comprising only (1/4) of all reported cases of sebaceous carcinoma. Extraocular sebaceous carcinoma in the post-auricular region or in the external auditory canal is very rarely described in the literature. A case of a rapidly growing sebaceous carcinoma of the pinna occurring in a pregnant woman is reported here for its rarity.