Conventional colonoscopy and magnified chromoendoscopy for the endoscopic histological prediction of diminutive colorectal polyps: A single operator study

Table 1 Characteristics of patients and indications for chromoendoscopy

Characteristics of patients
Patients (n)	150
Gender (males/females)	93/57
Age (yr), mean (range)	58.9 (37-85)
Indications for chromoendoscopy
Screening	58
Family history	50
Lower GI bleeding	26
Altered bowel habit	16

Table 2 Characteristics and distribution of colonic lesions

No. of lesions	240
0-Ip (protruded, pedunculated)	18
0-Is (protruded, sessile)	122
0-IIa (superficial, elevated)	100
Adenomatous polyps	82
Non-adenomatous polyps	158
Distribution of colonic lesions
Rectum	76
Sigmoid	96
Left colon	22
Transverse	6
Right colon	40

Table 3 Actual and predicted histology of 240 polyps by conventional colonoscopy

	Histology
	AP1	non-AP1
Endoscopic prediction: AP	75/82	50/158
Endoscopic prediction: non-AP	7/82	108/158

¹AP = adenomatous polyps; non-AP = non-adenomatous polyps.

Table 4 Actual and predicted hystology of 240 polyps by high-resolution chromoendoscopy

	Histology
	AP1	non-AP1
Endoscopic prediction: AP	80/82	9/158
Endoscopic prediction: non-AP	2/82	149/158

¹AP= adenomatous polyps; non-AP= non-adenomatous polyps.