Accurate preoperative determination of the stage of rectal cancer will identify patients likely to benefit from adjuvant therapies. The aim of this study was to compare preoperative computerized tomography and endoanal magnetic resonance imaging using an internal coil with the operative findings and histology of resected low rectal cancer (i.e., carcinoma located <8 cm from the anal verge). Fifteen patients with low rectal cancer were examined preoperatively using endoanal magnetic resonance imaging and abdomino-pelvic computerized tomography scans. Imaging results were compared with the operative findings and histopathology of the excised specimens. Tumours were classified as T1/T2 if confined to the bowel wall and T3/T4 if extending beyond the bowel wall. All detectable nodal tissue >0.5 cm on imaging was regarded as positive for malignancy. Results showed that T staging was correctly predicted by endoanal magnetic resonance imaging in 73.3% (11/15) and by computerized tomography in 86.8% (13/15). Nodal staging was correct in 50% (7/14) by magnetic resonance imaging and in 78.6% (11/14) by computerized tomography. Magnetic resonance imaging was successful in predicting overall TN staging in 64.3% (9/14) and computerized tomography was accurate in TN staging in 78.6% (11/14). Magnetic resonance imaging and computerized tomography equally predicted the state of lateral resection margins in 92.9% (13/14). It is concluded that endoluminal magnetic resonance imaging is of similar accuracy to computerized tomography in the assessment of tumour depth, worse in the determination of nodal status and similarly predictive of lateral resection margin status prior to total mesorectal excision.
|Number of pages||6|
|Journal||Techniques in Coloproctology|
|Publication status||Published - Dec 1 1998|
- Magnetic resonance imaging
- Preoperative staging
- Rectal cancer
ASJC Scopus subject areas