- Armed Forces Institute of Pathology
- FOREIGN BODY/CHRONIC
- Anthracosilicosis is a common incidental finding in many animal species as a result of urban life. Inhaled pigments are phagocytized by macrophages which aggregate not only in the interstitial connective tissue surrounding airways, but in more longstanding or severe cases, are often found in the hilar lymph nodes as well. Histologically, black granules are found within the cytoplasm of macrophages; under polatrized light, spicules of silica are refractile in these cells as well.