- A cyst of the little glands in the eyelids that make a lubricant which they discharge through tiny openings in the edges of the lids. The lubricant is a fatty substance called sebum characteristic of sebaceous glands. These glands are called the meibomian glands. Inflammation of them is termed meibomianitis or, alternatively, meibomitis. Chronic inflammation of the meibomian glands leads to meibomian cysts or chalazions. The word "chalazion" is Greek for small pimple (and little hail). Like a pimple, a chalazion is an inflamed swelling. But instead of being on the skin, a chalazion is in the margin of the eyelid.
* * *A chronic inflammatory granuloma of a meibomian gland. SYN: chalaza (1), meibomian cyst, tarsal cyst. [G. dim. of chalaza, a sty]- acute c. SYN: hordeolum internum.- collar-stud c. a c. that extends through the tarsal plate anteriorly (c. externum) and toward the conjunctiva.
* * *cha·la·zi·on kə-'lā-zē-ən, -.än n, pl -zia -zē-ə a small circumscribed tumor of the eyelid formed by retention of secretions of the meibomian gland and sometimes accompanied by inflammation
* * *n.a swollen sebaceous gland in the eyelid, caused by chronic inflammation following blockage of the gland's duct. The gland becomes converted into a jelly-like mass, producing disfigurement of the lid. It may become secondarily infected, when it will be painful and may discharge. Treatment is by application of antibiotic ointments or surgical incision and curettage of the gland.
* * *cha·la·zi·on (kə-laґze-on) pl. chalaґzia, chalazions [Gr. â€œsmall lumpâ€] an eyelid mass that results from chronic inflammation of a meibomian gland and shows a granulomatous reaction to liberated fat when subjected to histopathological examination; sometimes called meibomian or tarsal cyst.
Medical dictionary. 2011.