Figure 1.

Figure 1A - Spontaneous bleeding of the mucosa in the rectal ampulla, which is completely occupied by coalescent angiodysplasia as from actinic proctitis.

At 10 cm from the anal sphincter there is a giant ulcer with an irregular border. The ulcer is about 5 mm deep in the mucosa and extends about 50% of the circumference of the lumen. The ulcer is almost completely covered by tightly adherent coagulum, and therapeutic endoscopic treatment is impossible. It was not considered prudent to perform biopsies.

Figure 1B - Minimal residual angiodysplasia, with no ulcers.