In ultrasound or X-ray imaging of human tissues, the normal tissue image of the body is used as the standard, and those that are higher than the normal tissue image are high-density images, those that are lower than the normal tissue image are low-density images, and those that are equal to the normal tissue image are isointense images. The low-density image is commonly associated with fluid, fat, liquefied and necrotic tissue.
Liver hypointense shadowing should be considered for hepatocellular carcinoma, liver cysts, postoperative necrotic or liquefied tissue in the liver (e.g., partial hepatectomy, radiofrequency ablation of the liver, etc.), and liver metastases from malignant tumors. Although there are more malignant hepatic hypodense shadows, not all of them are malignant and require further examination to exclude the possibility of malignancy.
Therefore, for hepatic hypointense shadow lesions, enhancement examinations with enhancers, such as enhanced CT and enhanced ultrasound, are often required to exclude the possibility of hepatic malignancy, which is of positive significance in determining the condition and prognosis of hepatic hypointense shadow lesions.