title: Large fetal congenital cystic adenomatoid malformations: growth trends and patient survival.
abstract: OBJECTIVE
  The prognosis for fetuses with large congenital cystic adenomatoid malformations (CCAMs) remains uncertain. This study examined the natural history of large fetal CCAMs managed expectantly at a major referral center.
  
  
  METHODS
  A 5-year retrospective review was conducted on fetuses diagnosed with a thoracic lesion (n = 59). Large CCAMs were identified on prenatal imaging and followed longitudinally. Perinatal outcomes were assessed.
  
  
  RESULTS
  Twelve (20.3%) fetuses had large CCAMs in the absence of other congenital anomalies. Peak CCAM size occurred at 25.3 +/- 3.6 weeks' gestation. Serial magnetic resonance volumetry demonstrated a trend toward decreasing CCAM mass volume relative to thoracic cavity volume over time. Overall, 6 patients, including 3 with signs of early hydrops, showed a marked regression of their lesions relative to estimated fetal weight. Five fetuses required an emergent intervention postnatally, including extracorporeal membrane oxygenation support (n = 1), cyst aspiration (n = 1), and lung resection (n = 5). Overall survival was 75%, with severe hydrops before 30 weeks seen in all 3 deaths.
  
  
  CONCLUSIONS
  Large fetal CCAMs tend to peak in size at 25 weeks' gestation and are characterized by in utero diminution relative to overall fetal growth. The prognosis for most fetuses with large CCAMs remains quite favorable under careful perinatal management.
authors.affiliation: Department of Surgery, Children's Hospital Boston and Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Shaun M
authors.initials: SM
authors.lastname: Kunisaki
authors.forename: Carol E
authors.initials: CE
authors.lastname: Barnewolt
authors.forename: Judy A
authors.initials: JA
authors.lastname: Estroff
authors.forename: Valerie L
authors.initials: VL
authors.lastname: Ward
authors.forename: Luanne P
authors.initials: LP
authors.lastname: Nemes
authors.forename: Dario O
authors.initials: DO
authors.lastname: Fauza
authors.forename: Russell W
authors.initials: RW
authors.lastname: Jennings
mesh_terms: D015331:Cohort Studies; D015615:Cystic Adenomatoid Malformation of Lung, Congenital / Q000175:diagnosis* / Q000401:mortality; D005260:Female; D005313:Fetal Death / Q000453:epidemiology*; D047109:Fetal Development / Q000502:physiology*; D005323:Fetal Monitoring; D005865:Gestational Age; D006801:Humans; D015160:Hydrops Fetalis / Q000175:diagnosis / Q000401:mortality; D007231:Infant, Newborn; D008279:Magnetic Resonance Imaging; D008297:Male; D011247:Pregnancy; D011256:Pregnancy Outcome; D011296:Prenatal Diagnosis / Q000379:methods; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D015996:Survival Rate; D014057:Tomography, X-Ray Computed; D016216:Ultrasonography, Prenatal