A 22 year old G2 P1 presents with rupture of membranes at 19 weeks. She subsequently delivers. Which of the following is seen in autopsy of lungs of nonviable fetus
High-Yield Explanation
Lung maturation stages:
Pseudo glandular stage : growth of intersegmental bronchial tree.
Canalicular stage : Bronchial cartilage plates extend peripherally.
Terminal sac stage : Respiratory bronchioles gives rise to terminal sacs.
Alveolar stage : alveolar epithelial lining thins to improve gas exhange.