Published online by Cambridge University Press: 19 November 2021
Prenatally diagnosed congenital lung malformations represent a wide variety of fetal pulmonary and airway anomalies, some of which may require close monitoring and perinatal follow-up. Historically these masses were only typically seen when they were very large, at which point they were associated with a high incidence of hydrops and a high termination rate; therefore a diagnosis of a fetal lung mass had a guarded prognosis. Widespread use of prenatal ultrasound improved detection of these masses and advances in surgical techniques have allowed for intervention in the fetal period. More recently, a better understanding of fetal physiology and the use of prenatal steroids has reduced the number of fetuses requiring in-utero intervention. When indicated, in-utero treatment requires a multidisciplinary approach with close attention given to the fetal physiology, risk of maternal complications, and unique anesthetic considerations.