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In endoscopic retrograde cholangiopancreatography (ERCP), a lateral-view endoscope is passed orally to the duodenum for visualization of the ampulla of Vater. Then under direct vision, a cannula is placed inlo the ampulla of Vater. Under fluoroscopic monitoring, a dye is iniected so that it flows retrograde (orcounter) to Ihe normal flow of secretions and makes [...]

These procedures permit examination of the distal large bowel without extensive preparation or sedation. Disease within the anal canal is best seen with an anoscope—a short, tubular instrument with a sharply angulated bevel that allows direct visualization of the canal and the distal rectum. The rigid sigmoidoscope, when passed to its full length of 25 [...]