Speckled hyperdensity shadows are seen in more diseases, most commonly or infectious diseases. A speckled hyperdensity shadow is relatively small in area and extent; if it is extensive, it is generally described as a large exudative shadow. Speckled hyperdensity shadows suggest bacterial infections that are not very serious, but are also seen in tuberculosis infections, i.e., tuberculosis, and fungal infections that can also cause speckled hyperdensity shadows, the most serious being malignant tumors. Sometimes it is difficult to distinguish these conditions from imaging alone, but now with the development of medical technology, there are many other means to assist in determining the specific cause of the speckled shadow, including combining bronchoscopic means, blood tests, alveolar lavage fluid, etc., which can identify whether it is an infection or non-infection, and whether the tumor is benign or malignant.