Inflammatory changes of pancreatic head and descending duodenum.
Hypodense soft tissue sheets in the pancreaticoduodenal groove, associated with inflammatory stranding within the surrounding fat and in the right anterior pararenal paraduodenal space, thickening of duodenal wall and enlarged periduodenal lymph nodes.
A mesenteric calcified structure is noted in the right lower quadrant, most likely representing a calcified lymph node.