Abstract
Interstitial lung disease is a large group of diseases of various etiologies characterized by inflammatory lesions of the walls of the alveoli (alveolitis) and the surrounding interstitial tissue. Currently, this group includes more than 130 diseases; however, interstitial lung diseases do not include infectious lung diseases of known etiology and malignant tumors (eg, lymphogenous carcinomatosis), which may cause similar clinical symptoms [2]. ILD is rightly considered an immunopathological disease, in the development of which the leading role belongs to allergic reactions of the 3rd and 4th types [1].