T2 magnetic resonance imaging combined with diffusion-weighted imaging for colon cancer lymph nodes

Table 1 Qualitative diagnosis of the disease

Diagnostic method		Gold standard (n)		Sensitivity (%)	Specificity (%)	Accuracy (%)	Positive predictive value (%)	Negative predictive value (%)
		Malignant	Benign
Magnetic resonance T2WI	Malignant	64	10	84.21	77.27	81.67	86.49	73.91
	Benign	12	34	86.84	75.00	82.50	85.71	76.74
Diffusion-Weighted Imaging	Malignant	66	11
	Benign	10	33	97.37	97.73	97.50	98.67	95.56
Combined	Malignant	74	1
	Benign	2	43
χ2 value				7.824	9.927	17.098	9.042	8.477
P value				0.020	0.007	< 0.001	0.011	0.014

T2WI: T2-weighted imaging.

Table 2 Diagnostic value in clinical staging

Diagnostic method		Gold standard (n)		Sensitivity (%)	Specificity (%)	Accuracy (%)	Positive predictive value (%)	Negative predictive value (%)
		T1-T2	T3-T4
Magnetic resonance T2WI	T1-T2	25	12	69.44	70.00	69.74	67.57	71.79
	T3-T4	11	28	72.22	72.50	72.37	70.27	74.36
Diffusion-weighted imaging	T1-T2	26	11
	T3-T4	10	29	94.44	95.00	94.74	94.44	95.00
Combined	T1-T2	34	2
	T3-T4	2	38
χ2 value				8.065	9.196	17.258	9.062	8.180
P value				0.018	0.010	< 0.001	0.011	0.017

T2WI: T2-weighted imaging.

Table 3 Diagnostic value in lymph node staging

Diagnostic method		Gold standard (n)		Sensitivity (%)	Specificity (%)	Accuracy (%)	Positive predictive value (%)	Negative predictive value (%)
Lymph node metastasis		Yes	No
Magnetic resonance T2WI	Yes	29	12	74.36	67.57	71.05	70.73	71.43
	No	10	25	71.79	72.97	72.37	73.68	71.05
Diffusion-weighted imaging	Yes	28	10
	No	11	27	94.87	94.59	94.74	94.87	94.59
Combined	Yes	37	2
	No	2	35
χ2 value				7.901	8.931	16.546	8.425	8.105
P value				0.019	0.011	< 0.001	0.015	0.017

T2WI: T2-weighted imaging.