Solution: This is a case that really shows how protean lymphoma can be. The imaging findings essentially boil down to a large heterogeneous mass that has its epicenter in the pancreas, but also extends out into the mesenteric root and questionably into the peritoneum itself. The mass is very infiltrative and although it is large, it is not really causing obstruction of the vessels are ducts that are involved. It is not typical for any primary pancreatic tumor and doesn't look like or act like a sarcoma. This turns out to be Non-Hodgkins lymphoma. Just remember to keep lymphoma on your diagnostic list for almost any mass.