Osteochondroma

• In cats, horses and dogs
• Appear in young animals and stop growing when the bones cease growth
• Defect of skeletal growth
• Possibly inherited in dogs and horses
• Grossly:
  • Multiple
  • Cartilage capped projections on external surface of bone
    • Undergoes endochondral ossification
  • Marrow spaces of the masses communicate with the parent bone
• May:
  • Interfere with actions of tendons and ligaments
  • Cause compression of spinal cord
  • Become malignant -> chondrosarcoma
• Seen in adult cats**In flat bones
  • Do not undergo endochondral ossification
  • Associated with FeLV?
  • May also become malignant