The internal diameter of the portal vein is about 10 mm, which is a measurement of the width of the portal vein on imaging, and the corresponding condition is within the normal range. The portal vein is observed during the imaging examination of the liver, and the normal width of the portal vein is between 6 and 10 mm. At present, the internal diameter of the portal vein is about 10mm, and the corresponding result is within the normal range, so there is no need to intervene too much. It is necessary to combine with other indicators to make a comprehensive judgment, mainly including clinical history and other auxiliary examination. The internal diameter of portal vein is about 10mm, purely from the width is no problem, some patients have a history of tumor, need to do enhancement examination to exclude the possibility of tumor embolism, need to be standardized under the guidance of clinicians.