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AIM:To identify the charactedsUcs of morphology,location and collateral circulation involved in paraesophageal varices (para-EV) of portal hypertension patients with 64-row multidetector computed tomograghy (MDCT).METHODS:Fifty-two of 501 patients with portal hypertensive cirrhosis accompanied with esophageal varices were selected for 64-row MDCT examination after the observation of para-EV.The CT protocol included unenhanced,arterial and portal phases with a slice thickness of 0.625 mm and a scanning field of 2 cm above the bifurcation to the lower edge of kidney.The CT portal venography (CTPV) was reformatted on AW4.3 workstation.The characteristics of origination,location,morphology and collateral circulation in para-EV were observed.RESULTS:Among the 52 cases of para-EV,50 showed the originations from the posterior branch of left gastric vein,while the others from the anterior branch.Fifty cases demonstrated their locations close to the esophagealgastric junction,and the other two cases were extended to the inferior bifurcation of the trachea.The circuitous pattern was observed in 16 cases,while reticulated pattern was seen in 36 cases.Collateral circulation identified 4 cases of single periesophageal varices (peri-EV) communication,3 cases of single hemiazygous vein,one case of single inferior vena cava,41 cases of mixed type (collateral communications of at least 2 of above mentioned types) and 3 cases of undetermined communications.Among all the cases,43 patients showed the communications between para-EV and peri-EV,while hemiazygous vein (43 cases) and inferior vena cava (5 cases) were also involved.CONCLUSION:Sixty-four-row multidetector computed tomograghy portal venography could display the location,morphology,origin,and collateral types of paraEV,which provides important and referable information for clinical management and disease prognosis.