Neonatal death despite fetal therapy for cystic adenomatoid malformation. A case report.

A pulmonary cystic adenomatoid malformation with evolving fetal hydrops was diagnosed in the early third trimester. Serial needle aspiration succeeded in resolving the hydrops; however, despite lobectomy the neonate died of microscopic contralateral disease undetected on ultrasound. The extent and nature of the underlying anomaly may limit the efficacy of fetal therapy for cystic adenomatoid malformation.