Abdominal x-ray enema through the rectum. The term "barium enema" usually refers to a lower gastrointestinal series, although enteroclysis (an upper gastrointestinal series) is often called a small bowel barium enema. Abdominal x-ray An abdominal x-ray is an x-ray of the abdomen. It is sometimes abbreviated to AXR, or KUB (for kidneys, ureters, and urinary bladder). In children, abdominal x-ray is indicated in the acute setting: Yet, CT scan is the best alternative for diagnosing intra-abdominal injury. For acute abdominal pain in adults, an abdominal x-ray has a low sensitivity and accuracy in general, as well as for specific conditions such as
Rectum Rectum The rectum is the final straight portion of the large intestine in humans and some other mammals, and the gut in others. The adult human rectum is about long, and begins at the rectosigmoid junction, the end of the sigmoid colon, at the level of the third sacral vertebra or the sacral promontory depending upon what definition is used. Its caliber is similar to that of the sigmoid colon at its commencement, but it is dilated near its termination, forming the rectal ampulla. It terminates at the level of the anorectal ring (the level of the puborectalis sling) or