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orbital cellulitis

(postseptal cellulitis) An infection of the fat and muscles around the eye, affecting the eyelids, eyebrows, and cheeks. The orbit (eye socket) is the bony structure in which the globe (eyeball) is housed, and it also contains extraocular muscles, fat, and the blood vessels and nerves that supply these structures. The orbit is surrounded by the frontal, ethmoid, and maxillary sinuses, infection often results from extension of a sinus infection. The orbital septum is a membranous sheath extending from the periosteum of the orbit to the tarsal plate located in the eyelid, and is the key anatomical structure in differentiating. (Comparison) preseptal cellulitis: Infection of the eyelids and surrounding soft tissues that are anterior to the orbital septum. It can arise from sinusitis, local trauma, foreign body, or bug bite. orbital cellulitis: Inflammation of the soft tissues (muscles, fat, and connective tissue) of the orbit. (Complication) It can result in irreversible vision loss to the affected eye due to compartment syndrome, which occurs when the pressure within a compartment increases, restricting the blood flow to the area and potentially damaging the muscles and nearby nerves. It is an ophthalmic emergency, lateral canthotomy and cantholysis is the treatment of choice and involves surgically exposing the lateral canthal tendon and its inferior crus to relieve intraorbital pressure.