What does an abdomen scan show?

Depends on scan: It really depends on the specific test. A ct scan of the abdomen can demonstrate goo anatomical detail and look for many possible things like tumors, perforations in the bowel, gall bladder disease, kidney stones, abscess formation ( collections of pus) and inflammation of the pancreas (pancreatitis) to name just a few things. Other scans exist , that may be less sensitive and more limited.