Background: Pulmonary hydatid cystic disease or pulmonary cystic echinococcosis is caused by the tapeworm Echinococcus granulosus. The cysts are usually incidental findings of well-defined round lesions on chest radiographs or on a computer tomography which can rupture and cause symptoms. Case Presentation: This case report presents a complicated clinical course of pulmonary hydatid cystic disease in a 50-year-old farm worker, in whom the diagnosis was not initially thought of. Conclusion: The discussion highlights the importance of considering this disease in the differential diagnosis of any pulmonary cystic lesion, as significant complications arose because of the investigations performed.

Keywords: Nodule, cystic echinococcosis, hydatid lung disease, case report