Antenatal ultrasound detection of cystic adenomatoid malformation of lung: report of a case and review of the recent literature.

We have described a case of cystic adenomatoid malformation of the lung, detected before birth. The ultrasound findings demonstrated in this case correlated well with both the radiographic appearance of the lesion and with the gross pathology. Though we do not feel that the ultrasonic findings described are specific for this entity, they are believed to be characteristic of at least one type of cystic adenomatoid malformation. The prognostic significance of associated polyhydramnios and fetal anasarca is discussed. The importance of detecting this lesion antenatally is highlighted in this case in which the malformation would most likely have gone undetected in the perinatal period were it not for the antenatal ultrasonic findings.