Hydatid cyst disease caused by Echinococcus granulosus continues to be an important health problem today. The doubling time in hydatid cyst is known as 16-20 weeks. It is stated that the growth of hydatid cyst in the lung may be faster. However, there is no data in the literature to prove this. In this study, we presented a case showing that the doubling time of hydatid cysts in children may be faster.