A key feature of mycoplasma pneumonia is the low number of positive pulmonary signs and significant imaging. The lesions tend to be cloudy, low-density sheet-like infiltrates with blurred margins radiating from the hilum to the peripheral lung fields, and may also appear as large solid shadows when solid lung lesions are involved. Some cases show segmental distribution or diffuse distribution of reticular and nodular infiltrates in both lungs. Pleural effusions are rare. Compared to common bacterial pneumonia, which usually presents with a single solid shadow or sheet-like infiltrate in the lower lung, mycoplasma pneumonia involves the upper lung or both lungs more often, and the absorption is slower, taking 2 to 3 weeks even after effective treatment, and in some patients it is even delayed to 4 to 6 weeks for complete absorption.