Preoperative colonoscopy through the colonic stent in patients with colorectal cancer obstruction

Table 1 Synchronous neoplasms detected during preoperative colonoscopy

	Synchronous polyp (n)	Synchronous cancer (n)
Ascending colon	High-grade adenoma (1)
	Low-grade adenoma (7)
Transverse colon	Low-grade adenoma (7)
Descending colon	Low-grade adenoma (4)
Sigmoid colon	Low-grade adenoma (3)	Adenocarcinoma (1)
Rectum	Low-grade adenoma (3)	Adenocarcinoma (1)

Table 2 Factors that affected complete colonoscopy n (%)

	Complete colonoscopy group (n = 30)	Incomplete colonoscopy group (n = 18)	P value
Age (mean ± SD)	65.3 ± 13.6	61.3 ± 11.4	0.30
Sex (M/F)	18/12	10/8	0.76
BMI (mean ± SD)	23.3 ± 3.25	23.2 ± 2.96	0.86
Abdomen OP	8 (26.6)	2 (11)	0.28
History
T stage (T3/T4)	24/6	13/5	0.53
N stage	10/9/10	3/9/6	0.25
(N0/N1/N2)
Tumor location			0.13
Proximal T colon	1	0
Splenic flexure	1	2
Descending	7	2
SD junction	1	0
Sigmoid	17 (56.6)	9 (50.0)
RS junction	1	5
Rectum	2	0
Tumor located at	2 (6.7)	6 (33.3)	0.04
An angle
Tumor length	6.25 ± 2.44 cm	6.06 ± 2.45 cm	0.79
(mean ± SD)
Stent placement	7 (23.3)	10 (55.6)	0.02
at an angle
Stent expansion	19.96 ± 2.68	15.13 ± 2.84	< 0.01
diameter
(mean ± SD, mm)
Stent length	9.4 ± 2.11	8.6 ± 1.37	0.19
(mean ± SD, cm)
Stent placement	7.93 ± 1.85	8.11 ± 1.85	0.74
to colonoscopy
(mean ± SD, d)

Table 3 Multivariate analysis of factors for successful complete colonoscopy through the stent

	Odds ratio	95%CI	Pvalue
Stent diameter ≥ 17 mm	58.3	5.08-668.58	< 0.01
Stent located at angle	1.88	0.26-13.44	0.53
Tumor located at angle	5.83	0.36-92.36	0.21