top arrow : air in the portal vein branches below arrows : air in the wall of bowel(Pneumatosis Intestinalis) Cause : ischemia
Ans: Gallstone Ileus A mechanical obstruction resulting from the passage of a large Gallstone into the bowel through a cholecystoduodenal fistula. Obstruction is often at ileocecal junction. It Classically presents as subacute SBO in an elderly woman. The Gallstone ( 2.6 cm in this case ), Intestinal Ileus & the characteristic Pneumobilia ( Air in the Biliary Tree ) are clearly seen in this image.