Calcified foci of tuberculosis are localized calcium deposits caused by the healing of tuberculosis infection, tuberculosis by Mycobacterium tuberculosis infection, the formation of chronic respiratory infectious diseases, typical tuberculosis is mainly tuberculosis of the lungs, but also can be caused by the pleura or intestinal tuberculosis, as well as lymphatic tuberculosis. Most patients do not develop calcification during the onset of tuberculosis, but after the disease improves, the necrotic inflammatory tissue slowly develops granulation proliferation, and is eventually encapsulated by fibrous tissue, forming calcified spots. Calcification of tuberculosis suggests that the disease is improving and the inflammation is under control before significant calcification occurs. If the tuberculosis recurs and does not show signs of calcification, but instead shows liquefaction and necrosis of the tissue, it is a sign of deterioration of the disease.