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Inferior mesenteric vein: gray-scale and Doppler sonographic findings in normal subjects and in patients with portal hypertension.

he inferior mesenteric vein (IMV) drains venous outflow from the embryologic hindgut (i.e., distal transverse colon to proximal rectum) to the portal system. Whereas radiologists are familiar with the cross-sectional appearance of the IMV on CT and MRI [1– 3], I know of no report of the sonographic appearance of the IMV, despite descriptions of the sonographic features of the inferior mesenteric artery [4, 5]. In our practice, the IMV is routinely visualized on sonography when the pancreas is not obscured. Familiarity with the sonographic anatomy of the IMV minimizes the risk that this vessel will be mistakenly identified as the splenic vein and is useful in the evaluation of patients with portal hypertension. This article presents the sonographic appearance of the IMV in healthy subjects and in patients with portal hypertension.