An unseen filling defect in the hepatic vein is generally a normal finding, i.e., no occupying lesion is present. A filling defect in the hepatic vein is a result of a space-occupying lesion in the hepatic vein that prevents the contrast from being visualized on CT after injection of the contrast medium. The absence of a filling defect indicates that there is no abnormality in the hepatic vein and that the hepatic vein is well vascularized, which is a normal finding and does not require intervention. If there is a filling defect in the hepatic vein, it may be caused by a tumor, inflammatory lesion, or thrombus blockage, and requires prompt intervention to avoid further progression of the disease. It is important to pay attention to your health on a daily basis, and to check and intervene promptly if there is any discomfort.