Uveitis is an inflammation of the pigmented inner lining of the eye (choroid). Both the entire choroid and part of it can become inflamed. The name of a partial choroid inflammation depends on its location: anterior uveitis is an inflammation of the anterior part of the choroid, including the iris. Medium uveitis is an inflammation of the middle part of the choroid that spreads to the jelly-like substance that fills the eyeball (vitreous). Posterior uveitis is an inflammation of the back of the choroid that can spread to the retina and choroid. Panuveitis is an inflammation that covers the entire choroid.