Asbestosis is a lung condition, often referred to as a "diffuse pulmonary fibrosis" which results from the inhalation of asbestos fibers. It is one of a number of diseases categorized as occupational lung disease or environmental lung disease. A unique aspect of asbestosis that distinguishes it from other fibrotic diseases (such as silicosis) is the presence of asbestos bodies and fibers in the lung tissue. Additionally, asbestos bodies and fibers have been detected in small numbers beyond the lung: in tonsils, thoracic and abdominal lymph nodes, pleura, peritoneum, liver, spleen, pancreas, kidneys, small and large intestines, esophagus and stomach.