This disease is caused by coal dust or soot and smoke that was
absorbed, caught in the alveoli, and transported to the hilum and lymph
nodes and deposited. The entire lungs are blackish gray. Among domestic
animals, horses working in coal mines and dogs are frequently affected.
This specimen represents the lungs and trachea of a lion during a
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Address inquiries to the following.
Department of Veterinary Pathology, Faculty of Agriculture,
Iwate University., Morioka, 020-8550, Japan