The main purpose of lower extremity venous ultrasonography is to evaluate deep vein thrombosis (DVT) and leg varicosity. These screening examinations account for the majority of routine work. If you learn the procedure by acquiring a certain degree of skill, you will be able to deal with many types of screening examinations, but without knowledge of the disease state of various diseases, it is not possible to obtain sufficient examination results. Congenital venous malformation, i.e., Klippel-Trenaunay syndrome (KTS), may accompany deep vein hypoplasia and DVT, and the course of superficial veins is not uniform. Therefore, a standardized examination procedure for ultrasonography does not exist, but it is important to know how to indicate the various clinical conditions. Pelvic congestion syndrome (PCS) is the cause of a particular type of leg varicosity. It is possible to diagnosis suspected PCS by ruling out reflux to the sapheno-femoral junction and side branch, which are the cause of the normal types of varicosity (saphenous type, side branch type), and the presence of an incompetent perforating vein in the thigh back. Nutcracker syndrome may be the cause of PCS, so if it is a lean type of patient, left kidney venous disease should be confirmed. Many of the venous diseases are often caused by pressure change due to exclusion or reflux. When we encounter abnormal findings, we will confirm and guess what the cause is, and for that understanding we think that we need to understand the anatomy, physiology, and disease condition.
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