The liver is not well defined and the borders of the blood flow signal are still clear indicating that no blood flow signal has been detected within the lesion and that the blood flow signal of the lesion is relatively clear. Consider benign liver lesions such as liver cysts. Alternatively, smaller lesions such as hepatic hemangiomas and hepatocellular carcinomas may present with a temporary absence of blood flow signal and still clear borders. Liver cysts are benign lesions that are usually asymptomatic and may show no clear blood flow signal and clear borders on ultrasound. Regular observation is usually needed for this disease. When liver cysts increase in size, they can cause pressure on normal liver tissues, which may result in abnormal liver function, and surgical treatment is usually needed to open the liver cysts for drainage or resection. Smaller lesions such as hepatic hemangiomas, hepatic adenomas, and hepatocellular carcinomas may also show that the liver is unable to detect clear blood flow signals and the borders are still clear. Patients can go to the hepatobiliary surgery department of the local hospital to consult and listen to the professional doctor’s opinion, the above views are for reference only.