Isolated hydatid cyst of thyroid: An unusual case

Hydatid cystic disease is a parasitic infestation that is mostly caused by Echinococcus granulosus, which is common in sheep-rearing areas of the Mediterranean, Middle East, Australia, New Zealand, South Africa, and South America. Canines are the definitive hosts, and herbivores (e.g. sheep, horses, deer) or humans are intermediate hosts. Ingested eggs from animal feces hatch in the gut and release oncospheres (immature forms of the parasite enclosed in an embryonic envelope).

A very rare case of isolated, thyroidal, hydatic cyst is presented.

Non-vascular cysts may be seen on ultrasonographic examination that are not specific for hydatid disease. Clinical and laboratory findings are therefore important. Definitive diagnosis is based on histopathological findings. Treatment is surgical and antiparasitic drugs are required after surgery.