Computed tomography of entero-enteric intussusception.

Characteristic computed tomographic findings of entero-enteric intussusception were demonstrated with in vitro studies of surgically created intussusceptions in canine small bowel. The signs were effective in detecting intussusception in two patients, one with metastatic melanoma and a second with a plasmacytoma, both of whom had previously nondiagnostic standard oral contrast medium examinations. The findings consist of a dilated loop of bowel (the intussuscipiens) with a thickened wall, within which is an eccentric soft tissue mass (the intussusceptum) and an adjacent crescentic low density mass on the mesenteric side, representing the invaginated mesentery.