Mid-Sized Barns. Mid-Sized Barns-from 7 to 15 stalls. Some mid-sized horse barns are private, but often a mid-sized barn has to work for a living. . . as a boarding facility, a training barn, or the center of a breeding operation.
This can cause scarring. Asbestosis, caused by exposure to asbestos, causes scarring and might lead to lung cancer. Silicosis, caused by the inhalation of silica dust, will also cause scarring in the lungs. Mining of gold, lead, copper, zinc, iron and anthracite can result in silicosis if the proper precautions are not taken.
The most common causes include granulomas (clumps of inflamed tissue) and hamartomas (benign lung tumors). The most common cause of malignant lung nodules includes lung cancer, or cancer from other regions of the body that have spread to the lungs (metastatic cancer).