A complication of portal vein obstruction is?

The complication of portal vein obstruction that is most relevant in the context of this question is the development of esophageal varices. Portal vein obstruction leads to increased pressure in the portal venous system, which can cause blood to be rerouted through collateral vessels. When this occurs, the esophagus and other areas may develop varices, which are abnormally dilated veins. These varices are particularly concerning because they are at risk of bleeding, which can result in serious health complications.

The pathophysiology associated with portal hypertension, due to portal vein obstruction, highlights how elevated pressure influences venous drainage, fostering the formation of varices. Such complications underscore the importance of monitoring and managing patients with portal vein issues, as the risk of bleeding from esophageal varices is a significant clinical concern.

In contrast, the other options—fissure in ano, paralytic ileus, and diverticulum—are not directly related to portal vein obstruction and its ramifications. Each represents different clinical conditions that have their own distinct causes and implications, but they do not arise as a direct complication of portal hypertension. This clarification helps to reinforce the understanding of the broader impacts of portal venous obstructive conditions on the gastrointestinal system, particularly the risk of varices.