Abstract
A dermoid cyst in the orbit is a choristoma (clump of normal tissue in an atypical location). It results from the migration of ectoderm to a hypodermic location along embryonic lines of closure. Orbital dermoid cysts are usually located superiorly, either temporal or nasal. A dermoid cyst situated close to the lacrimal sac area is extremely rare (Only six published cases to the best of our knowledge). Here, we report a case of a dermoid cyst presenting with swelling over the lacrimal sac area simulating mucocele. The mass was excised by an external dacryocystorhinostomy (DCR) incision approach and the histopathological examination revealed a dermoid cyst. Although rare, the dermoid cyst should also be considered as one of the differential diagnosis in case of swelling in the lacrimal sac area.
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