Intramuscular lipoma of the eyelid.

To report a unique case of intramuscular lipoma of the eyelid and to alert surgeons to this entity that simulates a common dermoid cyst. A slowly-growing mass of the upper eyelid was excised from a 62-year-old man. Histology showed mature lipocytes interspersed with skeletal muscle. To our knowledge, this case represents the first report of intramuscular lipoma of the eyelid. Lipomas, including the intramuscular variety, are common tumors elsewhere in the body. The differential diagnosis of eyelid masses should include this entity.