Inferior mesenteric vein terminates when reaching the splenic vein, which goes on to form the portal vein with the superior mesenteric vein (SMV).
Tributaries of the inferior mesenteric vein drain the large intestine, sigmoid colon and rectum. These include:
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left colic vein
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sigmoid veins
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superior rectal vein
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rectosigmoid veins.
That’s why in the given clinical scenario in obstruction of IMV, there will be dilation of left colic vein.
Other option:
Option A: Middle colic vein is a tributary of superior mesenteric vein
Option B: Left gastroepiploic vein is a tributary of splenic vein
Option C: Inferior pancreatico-duodenal vein is a tributary of superior mesenteric vein.
Left Colic(A Tributary of Inferior Mesenteric Vein).