Tehran University of Medical Sciences Iranian Journal of Parasitology 1735-7020 6 4 2011 12 15 33 40 EN Y Hamzavi Department of Medical Parasitology and Mycology, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran M Vejdani Department of Medical Parasitology and Mycology, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran N Nazari Department of Medical Parasitology and Mycology, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran A Mikaeili Department of Medical Parasitology and Mycology, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran 2015 10 03 Background: Hydatidosis is the larval stage of the Echinococcus granulosus. This disease is en­demic in Iran. There are many studies about hydatidosis in different regions of the country, but there is not any information about the disease in Kermanshah Province. This article will review all available data about hydatidosis in this province. Methods: Using web based search engines and a survey on medical student's theses, all the informa­tion about hydatid cysts in the province from 1986 -2008 was collected. Results: During these twenty years, at least 482 proven cases of hydatid cyst have been identified in the province. Accordingly, the trend of hydatid cyst operation in the province has been grow­ing and the average annual number of cases has reached 1.41/100,000. Frequency of disease in urban areas was slightly higher than rural areas and the rate of infection in housewives was more than others. Conclusion: Because of the growing trend of hydatid cyst operation in Kermanshah Province, which may be due to many different reasons, this province should be considered as one of the impor­tant endemic regions of hydatidosis in Iran. https://ijpa.tums.ac.ir/index.php/ijpa/article/view/202 https://ijpa.tums.ac.ir/index.php/ijpa/article/download/202/201