abnormal Meibomian gland morphology Meibomian gland cyst MP:0013390 MPheno.ontology Meibomian cyst Meibomian gland lipogranuloma a non-malignant fluid-filled swelling (cyst) of the eyelid area due to non-infectious obstruction or malfunctioning of a Meibomian gland causing extravasation of lipid material in the eyelid soft tissues with focal secondary granulomatous inflammation chalazia chalazion eyelid lump tarsal cyst tarsal gland cyst