The endoscopic Mayo Score (Mayo endoscopic subscore) evaluates ulcerative colitis stage, based only on endoscopic exploration (subscore "Endoscopic findings" of the Full Mayo Score) and can be used on its own (1).
The following table shows the decoding for endoscopic findings, with some example images.

Mayo Score endoscopic: decoding and example images

Mayo 0
normal mucosa or inactive disease
Mayo 1
mild activity (erythema,
decreased vascular pattern,
mild friability)
Mayo 2
moderate activity
(marked erythema,
lack of vascular pattern,
friability, erosions)
Mayo 3
severe activity
(spontaneous bleeding,
large ulcerations)
  • Rutgeerts P, Sandborn WJ, Feagan BG, Reinisch W, et al. Infliximab for induction and maintenance therapy for ulcerative colitis. N Engl J Med. 2005; 353 (23): 2462-2476.