PULMONARY SEQUESTRATION: PATHOLOGIC FINDINGS
In classical PS: No bronchial connection; small bronchi within the lesion.
Pulmonary parenchyma: Dilated but otherwise normal alveoli, alveolar ducts and bronchioles; fibrosis (secondary to previous infections).
In 25% of cases: Cystic adenomatoid type change with dilated or nondilated bronchiolar spaces lined by ciliated cuboidal or columnar epithelium. This lesion can be labeled as congenital cystic adenomatoid malformation (CCAM) with systemic arterial supply.
In rare instances: PS may have communication with the esophagus or stomach.