RT Book, Section A1 Bush, Andrew A2 Rudolph, Colin D. A2 Rudolph, Abraham M. A2 Lister, George E. A2 First, Lewis R. A2 Gershon, Anne A. SR Print(0) ID 7050339 T1 Chapter 507. Congenital Disorders of the Lower Airways and Mediastinum T2 Rudolph's Pediatrics, 22e YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-149723-7 LK accesspediatrics.mhmedical.com/content.aspx?aid=7050339 RD 2024/04/19 AB Antenatal ultrasound diagnoses many congenital lung malformations, but we now have to decide what to do for a baby affected by an abnormality that may previously have escaped detection. Initial reports described a poor outcome for fetuses with lung masses detected in the second trimester. It is now clear that many lung lesions disappear or regress considerably by term, and the outcome for such fetuses is in general very good. Postnatal regression of lung malformations has also been described. The dilemma in the postnatal period is whether to opt for observation or surgery.