Cancer is caused by abnormal proliferation of epithelial tissue cells and is a kind of malignant tumor, so it will appear as localized hyper-echo during ultrasound examination. However, not all cancers are hyperechoic, and some small malignant tumors or hemangiomas may also appear hypoechoic. Therefore, when examining tumors by ultrasound, one cannot be sure that it must be a tumor based on hyperechoic or hypoechoic, but only based on clinical, combined with ultrasound examination, and specific areas should also be examined. If high echogenicity or hypoechogenicity is found in the liver, it can be determined whether it is liver cancer based on the symptoms of liver cancer, such as pain in the liver area, poor liver function or jaundice. If hypoechoic or hyperechoic is found on the adrenal gland, go for further examination for tumor on the adrenal gland. Based on the presence or absence of clinical symptoms and examination results, such as ultrasound examination reflecting hypoechoic and hypoechoic, MRI as well as CT examination can be performed to further clarify the diagnosis.