Hydatid cyst disease (hydatidosis or echinococcosis) is an important parasitic disease in all societies engaged in agriculture and animal husbandry, where environmental health and preventive medicine measures are insufficient. There are four different types of echinococci. The most common ones are echinococcus granulosus, which causes cystic echinococcosis, and echinococcus multilocularis, which causes alveolar echinococcosis. Lung hydatid cyst is a zoonotic infection caused by larval forms (metacestode) of echinococcus granulosus. In our case, a 77-year-old woman was admitted to the emergency department with cough sputum and high fever. Thorax tomography was performed for further examination and treatment. The patient was hospitalized for thoracic surgery. This case is presented to emphasize the importance of physical examination and imaging methods in patients presenting to the emergency department with classic upper respiratory tract infection or community-acquired pneumonia clinic.