Accessory Lungs

• Most common developmental disorder, especially in cattle
• Incompletely differentiated pulmonary tissue present anywhere in the trunk
• Grossly:
  • Lobulated oedematous masses
  • May be connected to uper alimentary tract
• Histologically:
  • Dialated structures resembling bronchioles
  • Alveoli and ducts developed to varying degree
• May cause birthing difficulties