Congenital masses of the lung are a spectrum of interrelated abnormalities that includes congenital lobar overinflation, bronchogenic cyst, congenital cystic adenomatoid malformation (CCAM) and sequestration. The prenatal and postnatal imaging features of these lesions are reviewed, emphasizing the importance of serial prenatal sonograms and postnatal imaging studies, including radiography and computed tomography. Masses that become inconspicuous, or disappear on serial prenatal sonograms are discussed, as well as the importance of postnatal imaging studies in the evaluation of these lesions. Finally, the management of congenital masses of the lung is reviewed, emphasizing the importance of imaging studies in the preoperative evaluation.

Children with "disappearing" fetal lung masses have persistent abnormalities after birth that are often subtle on radiographs but are well demonstrated with CT.

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