Pulmonary Pigmentation

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