1. Introduction
Cystic adenomatoid malformation (CCAM) is a fetal lung malformation. It has been reported that the incidence of CCAM is between 1:11,000 and 1:35,0001. CCAM is characterized by benign malignancies or dysplastic lung tumors with excessive growth of terminal bronchioles and a decrease in the number of alveoli2. The perinatal mortality rate associated with prenatally diagnosed CCAM varies widely, ranging from 9% to 49%3. This is because the clinical characteristics of CCAM vary greatly, from acute respiratory distress at birth to incidental asymptomatic lesions on a chest radiograph at any age. Whether asymptomatic CCAM requires surgery during the neonatal period is still controversial, but it is clear that surgery is the accepted standard of care for all symptomatic CCAMs, even in neonates4,5. Infection is the most common presenting symptom6. We carried out surgical treatment for symptomatic CCAM patients after the infection had adequately subsided. CCAM can be treated with open or thoracoscopic resection. To date, few reports have compared the outcomes of the two surgical methods for the treatment of CCAM in neonates. Therefore, the purpose of this study is to compare the preoperative, intraoperative, and postoperative variables of the two surgical procedures and to determine whether the two surgical methods have an effect on the outcome of CCAM.