Improved visibility of colorectal tumor by texture and color enhancement imaging with indigo carmine

Table 2 Visibility scores of margin and surface for white light imaging, texture and color enhancement imaging, chromoendoscopy and texture and color enhancement imaging + chromoendoscopy

	WLI	TXI	CE	TXI + CE	WLI vs TXI, P value	TXI vs CE, P value	CE vs TXI + CE, P value
Margin, mean (SD)	2.44 (0.93)	2.90 (0.93)	3.37 (0.74)	3.75 (0.49)	< 0.001	< 0.001	< 0.001
Surface, mean (SD)	2.25 (0.80)	2.84 (0.84)	3.12 (0.72)	3.51 (0.60)	< 0.001	< 0.01	< 0.001

The visibility score was defined as follows: Score 4, excellent (easily detectable); score 3, good (detectable without careful observation); score 2, fair (hardly detectable without careful examination); score 1, (not detectable without repeated careful examination). WLI: White light imaging; TXI: Texture and color enhancement imaging; CE: Chromoendoscopy; TXI + CE: Texture and color enhancement imaging + chromoendoscopy.