Accurate preoperative staging is very important in predicting the prognosis of colorectal cancer. Significant occult hepatic metastases carry a poor prognosis. If the hepatic metastases group are subtracted from the group of apparently better-classified tumours, the prognosis of these tumours is much improved.
Intraoperative ultrasound is useful in finding occult hepatic metastases. However CT scan is indicated in the staging of colorectal cancer (1).
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