Hydatid Disease in the Central Region of Iran: A 5-year Epidemiological and Clinical Overview.

Introduction: Hydatid cyst is caused by an infection by the larval stage of . Patients with cystic echinococcosis often remain asymptomatic until the hydatid cysts grow large enough to cause symptoms and signs. The cysts grow in the course of several years before reaching maturity and the rate of growth depends on the location of the cyst.