Pulmonary cystic adenoma

Pulmonary cystic adenoma is a hamartoma of the lung with an unknown etiology, possibly caused by the overgrowth of fetal terminal bronchioles, forming well-demarcated lesions within the lung parenchyma. It often affects a part or the entire lobe, can involve unilateral or bilateral lung parenchyma, and mediastinal shift occurs in 90% of cases. It can generally be diagnosed prenatally by ultrasound, and after birth, the fetus mainly presents with dyspnea and edema.