There are patchy, high-density shadows in the lungs, which are solid lesions found clinically by taking a CT of the lungs with low air content. The most common is an inflammatory response, such as invasion by pathogens such as viruses, bacteria, mycoplasma, chlamydia, rickettsia and even Mycobacterium tuberculosis, which cause significant congestion and edema in the mucosa of the lungs and a large inflammatory response, generating a large amount of secretions and a large amount of inflammatory factors. At this time, the lungs will show patches of high-density inflammatory lesions containing large amounts of exfoliated tissue fragments, live and dead pathogens, and metabolites of the inflammatory reaction, which will show imaging manifestations of the lungs, and in most cases are completely curable and disappear with standard anti-inflammatory treatment.