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