Premature neonate (week 36 of gestation), 3 days old, respiratory
failure, autopsy specimen.
- Lung of a newborn
- Atelectatic and aeriferous, occasionally hyperinflated areas next
to each other
- In the non-inflated areas of the lung, the alveolar walls are
stacked (DD: inflammatory infiltrate)
- The unfolded air-filled alveoli, some of which hyperinflated,
contain PAS-positive hyaline membranes, which line the alveolar
walls like wallpaper.