There are two criteria to confirm the diagnosis of liver cancer: 1) the gold standard, the most reliable one is to perform a puncture biopsy and look at the pathological section under the microscope, which is found to be hepatocellular carcinoma or bile duct cell carcinoma in the liver to confirm the diagnosis of liver cancer. 2) if the methemoglobin is abnormally high and at the same time a clear occupancy is found on the liver lesion, of course The standard of methemoglobin is at least greater than 400μg/L, consider that it can be hepatocellular carcinoma. Simply seeing lesions on the liver with enhanced CT cannot confirm that it is hepatocellular carcinoma.