Cystic echinococcosis, a zoonotic disease, is common in Turkey and is caused by the Echinococcus granulosus tapeworm. We describe the case of an 8-year-old girl who was admitted to hospital with chest wall asymmetry after a fall from height, without any other symptoms. Cystic lesion was identified on radiology, and serology supported the diagnosis of hydatid cyst. The patient underwent thorax surgery. Postoperatively, she was treated with benzimidazoles for 2 months. Rarely, hydatid cysts can reach a size sufficiently large to cause chest deformity.