Cystic adenomatoid malformations (CCAM) are relatively rare developmental abnormalities of the lung characterized as a benign hamartomatous or dysplastic lung lesions due to overgrowth of terminal bronchioles with a reduction in the number of alveoli. The differential diagnosis of CCAM includes the following conditions Bronchopulmonary sequestration (BPS) Bronchogenic or Neuro-enteric cysts Diaphragmatic hernia Types of CCAM: Solid mass Cystic mass either: Macrocystic: cysts 2-10 cm  or Microcystic : cysts < 2 cm Investigations: It is mandatory to rule out associated and chromosomal anomalies before considering in utero management of large CCAM’s by doing the following investigations, which also helps in achieving a diagnosis Fetal ultrasound, echocardiogram, Ultrafast MRI and Karyotype In the presence of associated or chromosomal anomalies in the fetus, no in utero treatment should be…