Consolidation of the lung is a condition in which plasma, fibrin, and cellular components accumulate in the alveolar cavities for any reason, resulting in a decrease in alveolar air volume and a densification of the lung texture. The volume of the lung does not usually change (does not shrink) and may increase slightly. Etiology: 1, due to injury factors: (1) pneumonia: according to the pathogen can be divided into bacterial pneumonia, viral pneumonia, mycoplasma pneumonia, fungal infections of the lungs, chlamydia pneumonia, etc., for the cause of the most common cause of lung solid changes. Mycobacterium tuberculosis caused by caseous pneumonia can be manifested as pulmonary solid changes; (2) pulmonary parasitic diseases such as schistosomiasis, schistosomiasis and Pneumocystis carinii; (3) physical and chemical factors such as radiation pneumonitis and oxygen poisoning. (2) Abnormal immune response, such as allergic pulmonary infiltration (allergic pneumonia, pulmonary hemorrhage – nephritis syndrome, etc.). 3.Pulmonary circulation dysfunction such as cardiogenic pulmonary edema, pulmonary embolism and so on. 4.Others such as acute respiratory distress syndrome, alveolar protein deposition, etc. Clinical examination: 1, physical examination findings 2, visual diagnosis Thoracic symmetry, the sick side of the respiratory movement is weakened. Palpation: The trachea is centered, and the voice tremor is enhanced on the sick side. Auscultation: The lesion is turbid on percussion. Auscultation Bronchial breath sounds and loud wet rales can be heard at the lesion site, and voice resonance is enhanced; pleural friction can be heard if the pleura is involved.