Endoscopic ultrasonography (EUS) has significantly improved our understanding of the complex vascular structural changes that occur in portal hypertension and their clinical and prognostic significance. EUS in combination with color Doppler technique enables us to study the hemodynamic changes in the portal venous system noninvasively, and to determine objectively the effect of different pharmacological agents on portal hypertension. EUS has also found some role in the treatment and follow up of esophageal and gastric varices. It may play a clinical role in the diagnosis of gastric, duodenal, and rectal varices. Recently reported EUS-based devices that measure variceal wall tension and intravariceal pressure noninvasively could have an impact on the identification of patients at high risk of variceal bleeding with the aim of initiating prophylactic treatment, and in the assessment of patients' responses to drug therapy of portal hypertension. EUS is occasionally very helpful in the clinical management of portal hypertension. It is an interesting and important research tool for many experimental indications that are not routinely applied in clinical practice at this time.
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