Visibility of the bleeding point in acute rectal hemorrhagic ulcer using red dichromatic imaging: A case report

Figure 2 Endoscopic images of emergent colonoscopy. A: Massive pulsatile bleeding from the ulcer on the lower rectum hindered the detection of the bleeding point with white light imaging; B: After switching to red dichromatic imaging, the bleeding point was observed as deep yellow (orange arrow) compared to surrounding blood, and that allowed us to recognize it precisely; and C: The bleeding vessel was coagulated, and hemostasis was achieved successfully with red dichromatic imaging.