Abdominal cystic tumors containing small amount of fat in the septa: report of two cases

We present two cases of abdominal cystic tumors containing small amounts of fat in their septa. Although the final pathologic diagnoses of these tumor s were cystic lymphangioma and angiomatosis, the computed tomographic and m agnetic resonance imaging features were almost identical and indistinguisha ble; a purely cystic mass around the region of the pancreas head associated with little mass effect on the surrounding organs and septa containing a r adiologically evident fatty component. Radiologists should be aware of thes e two entities as differential diagnoses of abdominal cystic masses contain ing small amounts of septal fat.