From the case:
Kikuchi level
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Kikuchi et al classified the degree of infiltration of sessile early invasive colorectal cancer into the above three levels. Preoperative assessment of the level may decrease incidence of unnecessary surgery in sessile polyps.
Figure 1: Invasion of superficial third of submucosa
Figure 2: Invasion up to intermediate third of submucosa
Figure 3: Invasion extending to inner surface of muscularis propria