Contributor: Gordon K. Klintworth
Choroiditis may develop as a result of an infection due to various types of of microrganisms, such as bacteria [bacterial infection], fungi [fungal infection], protozoa [protozoal infection], viruses [viral infection], rickettsia [rickettsial infection]. It can also be a manifestation of  immunologic disorders such as sympathetic ophthalmia. Sometimes the cause is idiopathic. It may be focal or diffuse and can be a component of a more widely located uveitis. Choroiditis may be a manifestation of  as toxoplasmosis, tuberculosis and brucellosis. An infectious choroiditis can complicate retinitis caused by Herpes simplex virus or varicella-zoster virus. Other conditions with choroiditis include Vogt-Koyanagi-Harada disease and sarcoidosis.