Table 2. Relationship between the classification determined by ME-NBI and pit pattern analyses and histopathological diagnosis by Vienna classification for non-ampullary duodenal tumors.

Magnifying endoscopy	Vienna classification		P value
	Category 3, n = 73	Category 4, n = 30
ME-NBI, n (%)
Type B	65 (89)	5 (17)	< 0.01
Type C	8 (11)	25 (83)
Pit pattern, n (%)
Regular	64 (88)	7 (23)	< 0.01
Irregular	9 (12)	23 (77)

ME-NBI; magnifying endoscopy with narrow-band imaging.