Pulmonary Pigmentation

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Pigmentation

  • Permanent abnormal discoloration

Melanosis

  • Individual parenchymal lobules are affected
  • Pigment is present in the alveolar walls of calves and lambs
  • Most likely congenital

Anthracosis

  • Diffuse greyish discoloration

Carbon in the connective tissue around airways and vessels, after being brought and deposited there - sequestration - by macrophages from the alveoli

  • Used to be seen in town-dwelling dogs and cats