The etiology of lobar pneumonia is different, so the changes on the X-ray have both common and distinctive features. In the early stages, the lung texture is thickened, and later small patchy shadows appear, mostly in the lower lung fields, the middle and inner bands, and the cardiodiaphragmatic region, and may be accompanied by pulmonary atelectasis or emphysema. The pattern of the lesions is mainly inflammatory exudate in the alveoli, which spreads along the bronchi and invades small lobes, segments or lobes. x-ray signs may show non-specific small patchy infiltrative shadows of the lung parenchyma, more often in the two lungs, the diaphragmatic angle area and the medial band. this change is common in infants and children under 2 years of age. small patchy lesions may partially fuse together into large infiltrative shadows, which may even resemble segments or lobes. morphology of pneumonia. If a larger number of small round lesions are present in the lesion, the possible presence of multiple mixed septic infections should be considered. Pulmonary atelectasis and emphysema signs Partial pulmonary atelectasis or emphysema can occur due to obstruction by endobronchial secretions and exudates from pneumonia, and emphysema is one of the common early signs in pediatric pneumonia, and the more severe the toxic symptoms the more pronounced the emphysema becomes. Interstitial lung X-ray signs Infants have well-developed interstitial lung tissue, and some interstitial lung X-ray signs can be seen when they have bronchopneumonia, including increased and blurred texture in the middle band of both lungs. Influenza virus pneumonia, measles virus pneumonia, and pertussis pneumonia can all cause interstitial lung inflammatory reactions with these X-ray signs. Most of the local lymph nodes around the hilar area are not enlarged or only show deepening of the hilar shadow, or even moistening around the hilar area. 5. Pleural X-ray signs Pleural changes are rare, and sometimes there may be one or bilateral pleuritis or pleural effusion. Although bronchopneumonia of various etiologies has common but not identical X-ray manifestations, it is necessary to master the X-ray manifestations of various pneumonias and closely combine them with clinical symptoms to make a correct diagnosis.