<unk> graphy is used to diagnose anal<unk>  in the past but is replaced by MRI nowadays. This is used to find out the anatomy of<unk> s.
Anal fistula x ray
Perianal abscess CT
Anal fistula ultrasound
Diverticulitis x ray
Perianal abscess MRI
Perianal abscess ultrasound
Anal fistula physical examination
Rectal prolapse abdominal x ray