Comparison of hydrocolonic sonograpy accuracy in preoperative staging between colon and rectal cancer

Table 1 Characteristics of the patients (n = 30)

	Colon cancer (n = 17)	Rectal cancer (n = 13)	P value
Sex			NS
Male	9	7
Female	8	6
Age			NS
Median (range)	52 (37-68)	56 (43-75)
Size			NS
Mean (range)	5.76 (3-9)	5.8 (3-9)
Time intervals to operation day			NS
Median (range)	4 (3-7)	5 (3-9)
Failure to passage of colonoscopy	7	1	NS
Shape			NS
Polypoid	4	3
Ulcerative	2	2
Ulcerofungating	4	4
Ulceroinfiltrative	7	4
Site
Rectum	-	13
Sigmoid colon	4	-
Descending colon	1	-
Transverse colon	6	-
Ascending colon	6	-

(P = 0.05, Mann-Whitney test), NS: no significance.

Table 2 Comparison of hydrocolonic sonography accuracy in depth of invasion between colon and rectal cancers (P = 0.038)

PathologicDiagnosis	Colon cancer				Accuracy (%)	Rectal cancer				Accuracy (%)
	T1	T2	T3	T4		T1	T2	T3	T4
T1	1				1/1 (100)			1		0/1 (0.0)
T2	1				0/1 (0.0)		2	1		2/3 (66.7)
T3		1	14		14/15 (93)		3	4	1	4/8 (50.0)
T4					0/0				1	1/1 (100)
Total	2	1	14		15/17 (88)		5	6	2	6/13 (46.2)

Table 3 Comparison of the accuracy of CT in depth of invasion (P = 0.048)

PathologicDiagnosis	Colon cancer				Accuracy (%)	Rectal cancer				Accuracy (%)
	T1	T2	T3	T4		T1	T2	T3	T4
T1		1			0/1 (0.0)			1		0/1 (0.0)
T2		1			1/1 (100)		1	2		1/3 (33.3)
T3		4	10	1	10/15 (66.7)		1	5	2	5/8 (62.5)
T4			0	0	0/0 (0.0)			1		0/1 (0.0)
Total	0	6	10	1	11/17 (64.7)		2	9	2	6/13 (46.2)

(P = 0.05, Mann-Whitney test).

Table 4 Comparison of the accuracy of hydrocolonic sonography in lymph node metastasis between colon and rectal cancers (P = 0.183)

PathologicDiagnosis	Colon cancer		Rectal cancer
	n (-)	n (+)	n (-)	n (+)
N (-)	8	1	4	5
N (+)	4	4	2	2
Total	12	5	6	7
Accuracy (%)	12/17 (70.6)		6/13 (46.2)

Table 5 Comparison of the accuracy of CT in lymph node metastasis (P = 0.275)

PathologicDiagnosis	Colon cancer		Rectal cancer
	n (-)	n (+)	n (-)	n (+)
N (-)	8	1	5	4
N (+)	3	5	2	2
Total	12	5	7	6
Accuracy (%)	13/17 (76.5)		7/13 (53.8)

(P = 0.05, Mann-Whitney test), N (-): lymph node negative, N (+): lymph node positive.