Chalazion epidermal cyst abnormal Meibomian gland morphology Meibomian gland cyst Meibomian cysts chalazion chalazia Meibomian gland cysts tarsal cyst cystic tarsal gland Meibomian gland lipogranuloma Meibomian gland lipogranulomas tarsal gland cysts eyelid lump cystic Meibomian gland tarsal gland cyst presence of one or more non-malignant fluid-filled cysts in 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 Meibomian cyst MP:0013390 tarsal cysts tarsal gland cyst