Orbital cellulitis is an infection of the eye that also affects the tissues that surround it. It often follows an inflammation of the ethmoid sinuses (acute ethmoiditis) due to an infectious agent such as a virus or bacteria and most frequently affects children. It appears as a swelling of the eye and surrounding structures (eyelid, sometimes cheeks), exophthalmos (which gives the impression that the eye is coming out of its socket), pain, and trouble moving the eye in individuals with a fever. Hospitalization is necessary and a CT scan is often performed before recommending a treatment with antibiotics
and corticosteroids. The quality of eyesight is threatened.