Abstract
The aim of the present study was to evaluate the value of diffusion-weighted imaging (DWI) and water imaging combined with dynamic contrast-enhanced scanning for the preoperative diagnosis and staging of rectal cancer. In total, 72 patients with pathologically confirmed rectal cancer were selected for examination using magnetic resonance imaging (MRI) with phased-array coils, DWI, water imaging and dynamic contrast-enhanced scanning. The patients were divided into two groups, experimental (simple enhanced scanning plus diffusion combined with water imaging) and control (simple enhanced scanning), for the pathological observations. The sensitivity, specificity and accuracy for the T staging of the carcinomas using scan enhancement with DWI and the evaluation of cancer using water imaging were 98.5% (65/66), 66.7% (4/6) and 95.8% (69/72), respectively, and the accuracy for N staging was 89%. Whereas, the sensitivity, specificity and accuracy for the T staging of the carcinomas using simple scan enhancement were 85.7% (42/49), 78.3% (18/23) and 83.3% (60/72), respectively, and the accuracy for N staging was 61%. Therefore, the combination of multiple MRI techniques may be of high value for the early diagnosis and exact staging of rectal cancer.
Highlights
Rectal cancer is one of the most common malignancies of the digestive tract, ranking first in the worldwide incidence of malignant tumours
This study was conducted in accordance with the declaration of Helsinki and approval was obtained from the ZHAO et al: DIFFERENT Magnetic resonance imaging (MRI) TECHNIQUES IN THE PREOPERATIVE DIAGNOSIS AND STAGING OF RECTAL CANCER 2735
35 cases had tumours located in the upper rectum (10‐15 cm from the anal margin), 26 cases had tumours in the rectal midpiece (5‐10 cm from anal margin) and 11 cases had tumours in the lower segment of the rectum (
Summary
Rectal cancer is one of the most common malignancies of the digestive tract, ranking first in the worldwide incidence of malignant tumours. Magnetic resonance imaging (MRI) has the advantages of multidimensional imaging and clear display of the association between the rectum and its surrounding tissues, including the bladder, uterus and prostate. These advantages make MRI an important means of analysis for the preoperative evaluation of pelvic diseases. The use of MRI in staging rectal cancer has previously been reported [3,4], the majority of the studies have been performed using single screening technologies only. The aim of the present study was to evaluate the efficiency of the combined application of three MRI examination techniques in the staging of advanced rectal cancer preoperatively. The results were compared with the surgical and pathological observations
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