Prenatal diagnosis of congenital cystic adenomatoid malformation of the lung.

Ultrasonographic examination on a fetus at 24 weeks of gestation revealed an intrathoracic cystic mass with fetal hydrops and polyhydramnios. Pathological findings obtained at autopsy which was conducted on the fetus at 28 weeks indicated a typical congenital cystic adenomatoid malformation (CCAM) of the lung. The differential diagnosis and possible intrauterine treatment for lung CCAM are discussed.