It is not possible to generalize about the severity of low-density or high-density shadows; it is necessary to assess which is more severe depending on the specifics of the disease. Different density shadows on examination of diseased areas of the body are mainly dependent on the cause of the disease. High-density shadows are usually due to bleeding, calcification, etc., while low-density shadows are usually due to cysts, etc. High-density shadows can be associated with serious illnesses, and low-density shadows can be associated with serious illnesses, so it is not possible to generalize which of the two is more serious. When a lesion occurs in the body, it is necessary to consult a doctor in a timely manner. No matter whether there are high-density or low-density shadows, as long as the abnormality is present, it is necessary to further improve the CT or enhanced CT examination to clarify the nature of the abnormality, and then the doctor will decide on the next step of the treatment.