In portal hypertension alternative venous drainage is provided via sites of porto-systemic anastomosis including  the stomach  the duodenum  the porta hepatis  the anterior abdominal wall  the jejunum

Portal hypertension is a condition characterized by increased pressure in the portal venous system, which carries blood from the gastrointestinal tract, gallbladder, pancreas, and spleen to the liver. When this pressure increases, blood may be shunted away from the liver and into areas of lower pressure through porto-systemic anastomoses. These are connections between the portal venous system and the systemic venous system.

1. The stomach: This statement is correct. The lower part of the esophagus and the upper part of the stomach are common sites of porto-systemic anastomoses. In portal hypertension, these veins can dilate and form varices, which are at risk of bleeding.

2. The duodenum: This statement is incorrect. The duodenum is not a common site of porto-systemic anastomosis.

3. The porta hepatis: This statement is incorrect. The porta hepatis is not a site of porto-systemic anastomosis. It is the area of the liver where the portal vein, hepatic artery, and bile ducts enter and leave.

4. The anterior abdominal wall: This statement is correct. The veins of the anterior abdominal wall, specifically the paraumbilical veins, can serve as a site of porto-systemic anastomosis. In portal hypertension, these veins can dilate and become visible on the surface of the abdomen, forming a pattern known as "caput medusae."

5. The jejunum: This statement is incorrect. The jejunum is not a common site of porto-systemic anastomosis.