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The authors of the article prove the need to include a new name for the disease - "Progressive Fibrosing Lung Disease" into clinical practice. Recognition of the fact that some lung diseases end in a fibrosing process, which does not have any significant differences depending on the initial disease that led to fibrosis, will expand the indications for earlier prescription of antifibrotic drugs, which will undoubtedly improve the prognosis in this extremely severe category of patients.

Objective: to assess the favorable and unfavorable types of lung tissue fibrotic changes in patients with interstitial lung diseases (ILD) detected by high-resolution computed tomography (HRCT). MATERIAL AND METHODS. The results of examinations were analyzed in 385 patients: 181 with respiratory organ sarcoidosis, 130 with fibrosing alveolitis, 36 with histiocytosis X, and 38 with lymphangiolciomyomatosis. All the patients underwent HRCT; the data were compared with the results of comprehensive functional study of external respiration (CFSER), histological examination (in 70.1%), and the pattern of the disease., Results: Comparison of the clinical and functional course of ILD with the types of lung tissue fibrotic changes detected by HRCT and morphological examination showed that the favorable types of pulmonary fibrosis included stringy central and peripheral interstitial fibrotic changes and the atelectatic type of fibrosis, the occurrence of which failed to affect the development of obvious perfusion and diffusion disorders and to give rise to respiratory failure. The unfavorable types of pulmonary fibrosis included the peripheral pulmonary interstitial fibrotic changes (acinar fibrosis, honeycomb lung), which led to restrictive changes and perfusion disorders, which were accompanied by significant respiratory failure, decreases in quality of life and survival, as well as fibrotic changes in the walls of long-lasting air-containing cysts and a fibrotic Aevity mass that resulted Ind complications (pulmonary hemorrhage, pneumothorax, and pneumomediastinum)., Conclusion: The type of pulmonary fibrosis development is one of the major prognostic criteria for he course of ILD. HRCT makes it possible to assess its clinical picture as a whole and to reveal the type of development of fibrotic changes, their extent, the degree of involvement of the tracheobronchial tree in the process (formation of different types of bronchiectasis), concomitant extrapulmonary changes that may be clinically and functionally relevant (chest bone frame deformation, varying pleural changes, vascular disorders). Estimation of prognosis of the disease is most effective in comparing clinical, morphological, HRCT, and CFSER data.