A contrast-enhanced CT scan for a fistulogram helps in better visualization of the nature, shape and size of a fistula, an abnormal connection that forms between the two organs. Fistulas are often formed due to medical procedures and result in discharge as well as sharp pain around the fistula. Your doctor can advise this test if you experience symptoms such as sharp bowel pain, abdominal cramps, abdominal pain, discharge from vagina, diarrhea, elevated white blood count, fever, chills and body aches.