Value of high-resolution magnetic resonance imaging and dynamic contrast-enhanced scanning in the preoperative diagnosis of rectal cancer in older patients

Table 1 Demographic and clinical characteristics of patients with rectal cancer

Item	Number of cases	Percentage (%)
Total number	148	100.00
Sex
Female	148	100.00
Mean age (years)	67.6 ± 7.9
Tumor location
Upper rectum	24	16.22
Middle rectum	61	41.22
Lower rectum	63	42.57
Histopathological type
Conventional adenocarcinoma	142	95.95
Mucinous adenocarcinoma	6	4.05
Gross pathological type
Ulcerative	122	82.43
Exophytic	26	17.57

Table 2 Agreement between high-resolution magnetic resonance imaging combined with dynamic contrast-enhanced magnetic resonance imaging and pathological diagnosis for T staging of rectal cancer

		Pathological stage				Total
		T1	T2	T3	T4
MRI stage	T1	6	0	0	0	6
	T2	2	15	5	0	22
	T3	0	9	85	2	96
	T4	0	0	5	19	24
Total		8	24	95	21	148

T staging accuracy: 84.5% (95%CI: 78.1%-89.9%). MRI: Magnetic resonance imaging.

Table 3 Agreement between high-resolution magnetic resonance imaging combined with dynamic contrast-enhanced magnetic resonance imaging and pathological diagnosis for N staging of rectal cancer

		Pathological stage			Total
		N0	N1	N2
MRI stage	N0	45	10	0	55
	N1	22	17	6	45
	N2	15	19	14	48
Total		82	46	20	148

MRI: Magnetic resonance imaging.

Table 4 Sensitivity and specificity of high-resolution magnetic resonance imaging combined with dynamic contrast-enhanced magnetic resonance imaging for N staging of rectal cancer

N stage	Sensitivity (%)	Specificity (%)
N0	54.88	84.85
N1	36.96	72.55
N2	70.00	73.44

N0 sensitivity: 54.88% (95%CI: 43.2%-66.1%).