Abstract
Rectal endosonography is the most accurate means of pretherapy local staging of rectal cancer. Endosonographie criteria for determining tumor depth of invasion are well established. Although more accurate than computed tomography, results of endosonographic lymph node staging are less than optimum. Application of rectal endosonography to the evaluation of posttherapy recurrence appears useful but requires further definition. The current role of colonic endosonongraphy in colon cancer staging is limited. More prospective evaluation is necessary before determining what role, if any, colonic endosonography will play in the future staging of colon tumors.
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