Periocular sebaceous gland carcinoma: A comprehensive review.

Sebaceous gland carcinoma (SGC) is a rare tumour occurring at periocular and extra-ocular sites. SGC can be a challenging diagnosis for both clinicians and pathologists. High recurrence rates and a tendency for intra-epithelial spread, locoregional and distant metastases make it important for SGC to be suspected and be included in the differential diagnosis of an eyelid lesion. Early diagnosis, that may sometimes need ancillary testing, and prompt management using a multimodal approach can help reduce morbidity and mortality in patients with SGC.