Congenital pulmonary airway malformations (CPAM) are rare developmental anomalies often diagnosed on prenatal ultrasound. This case presents a 30-year-old female who had a routine ultrasound in the 13th gestational week which revealed cystic changes in the fetal left lung with polyhydramnios. The delivered baby underwent an uneventful open left lower lobectomy.

Keywords:  CPAM; Congenital lung lesions; Congenital pulmonary airway malformations; Cystic adenomatoid malformation ; Case Report.