Preoperative evaluation of synchronous colorectal cancer using MR colonography.
OBJECTIVE
It is well known that synchronous cancers (incidence, 2%-11%) and polyps (incidence, 12%-58%) occur in patients with colorectal cancer. Magnetic resonance colonography (MRC) seems like the obvious choice as a diagnostic tool in preoperative evaluation, because it is noninvasive, and most of the colon can be evaluated. Furthermore, it has higher patient acceptance, and no sedation or radiation is used. The purpose of this study was to determine the feasibility of performing MRC preoperatively in an everyday clinical situation in a group of patients who were not offered a full conventional colonoscopy or in whom full conventional colonoscopy was not possible.


METHODS
In a 13-month period, 47 patients diagnosed with rectal or sigmoid colon cancer scheduled for operation were included in the study. MRC was performed with bowel purgation either the night before surgery or as ambulatory MRC the week before surgery.


RESULTS
Full MRC was performed in 98% of the patients. In four patients, 12 synchronous lesions (one cancer, two plaques of carcinosis, and nine adenomas) were found. One flat adenoma and five small polyps were missed by MRC and perioperative palpation but found on postoperative colonoscopy. The findings resulted in altered operative strategies in three patients.


CONCLUSIONS
This study shows the feasibility and potential gain of preoperative MRC in patients with sigmoid colon cancer or rectal cancer.
Achiam
Michael P
MP
Department of Diagnostic Radiology, Copenhagen University Hospital Herlev, Herlev Ringvej, DK-2730 Herlev, Denmark. achiam1@dadlnet.dk
Holst Andersen
Lars P
LP
Klein
Mads
M
Chabanova
Elizaveta
E
Thomsen
Henrik S
HS
Rosenberg
Jacob
J
D000328:Adult; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000601:surgery*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D011300:Preoperative Care / Q000379:methods; D011379:Prognosis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity