Bronchial Hypoplasia

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  • Synonyms: congenital adenomatoid malformation, adenomatoid hamartoma
  • Grossly:
    • Some lung lobes are replaced by spongy or cystic tissue
  • Histologically:
    • Hypoplastic bronchi, no cartilage and no smooth muscle in their walls
    • May contain normal alveoli
  • May cause congenital lobar emphysema (below)