Prediction of synchronous colorectal cancers by computed tomography in subjects receiving an incomplete colonoscopy: A single-center study

Table 1 Clinical and pathological features of the concurrent carcinomas detected by computed tomography

Concurrent lesions	Incomplete colonoscopy		P value	Complete colonoscopy		P value
	CT+ (n = 13)	CT- (n = 16)		CT+ (n = 43)	CT- (n = 20)
Sex (M/F)	8/5	11/5		26/17	16/4
Median age (yr)	63	69		66	63
Mean maximum dimension (mm)	38 ± 11	24 ± 5	0.02	37 ± 13	25 ± 9	< 0.01
Gross appearance			0.20			0.18
Protruding	9	7		23	10
Ulcerated	2	5		9	8
Sclerotic	2	4		11	2
Differentiation			0.17			0.06
Well	3	4		9	8
Moderate	5	7		22	4
Poor	5	5		12	8
Location			0.71			0.41
Ascending colon	5	4		14	6
Transverse colon	2	2		6	4
Descending colon	4	5		13	6
Sigmoid colon	2	3		8	1
Rectum	0	2		2	3
Colonic obstruction			0.46			-
Yes	6	10		0	0
No	7	6		43	20
Average distance to index tumor (cm)	36.77 ± 6.86	19.88 ± 4.16	0.04	36.65 ± 3.55	24.00 ± 5.11	0.05
Located in the same bowl segments with index tumor			0.03			0.03
Yes	3	11		13	12
No	10	5		30	8

Table 2 Anatomical distribution of index and concurrent cancers in this cohort

Index lesion	Concurrent lesions
	Ascending colon	Transverse colon	Descending colon	Sigmoid colon	Rectum
Incomplete group
Ascending colon	6	1	3	1	1
Transverse colon	0	2	1	0	0
Descending colon	2	1	4	1	0
Sigmoid colon	1	0	1	2	1
Rectum	0	0	0	1	0
Total	9	4	9	5	2
Complete group
Ascending colon	10	1	4	3	1
Transverse colon	3	3	2	0	1
Descending colon		2	7	1	2
Sigmoid colon	0	2	1	4	0
Rectum	2	2	5	1	1
Total	20	10	19	9	5

Table 3 Overall sensitivity and specificity in the two groups

CT findings	Histological findings			Sensitivity (%)	Specificity (%)
	Positive	Negative	Total
Incomplete group				44.8 (26.5, 64.3)	93.6 (90.5, 96.0)
Positive	13	22	35
Negative	16	323	339
Complete group				68.3 (55.3, 79.4)	97.0 (96.0, 97.8)
Positive	43	51	94
Negative	20	1635	1655
Total	92	2031	2123

Values in parentheses are 95%CI. CT: Computed tomography.