D, dot type. Images of group A and B are more often associated with colonic type IM(32. 6%, 39. 5%), and group C and D with small intestinal type IM(25. 0%, 43. 8%).

• 结肠型化生的黏膜表面微细结构以不规则斑点型(32.；6%25)和网格型(39