Parasitic diseases of the orbit generally occur in developing countries. Trichinosis, caused by ingestion of the nematode Trichinella spiralis, may produce inflammation of the eyelids and extraocular muscles, resulting from larval migration. Echinococcosis, caused by the dog tapeworm Echinococcus granulosus, may manifest as a hydatid cyst within the orbit (Fig 4-6). Rupture of the cyst, which contains tapeworm larvae, may cause progressive inflammation and a severe immune response. Taenia solium, the pork tapeworm, may also encyst within the orbit and progressively enlarge to cause a condition known as cysticercosis.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.