the trend of hydatidosis in kermanshah province, western iran (1986-2008)

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.