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KMID : 1147320140010010019
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Journal of Surgical Ultrasound
2014 Volume.1 No. 1 p.19 ~ p.23
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Endorectal Ultrasonography: How to Perform and How to Interpret
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Lee Suk-Hwan
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Abstract
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Transrectal ultrasonography (TRUS) is a useful tool for evaluation of rectal tumors. Based on TRUS staging, decisions regarding treatment strategy would be based on whether local excision of the tumor is feasible or not. TRUS can differentiate between the different layers of the rectal wall. In recent years, it has become the diagnostic modality of choice for pre-operative staging of rectal tumors. The ability to image tumor invasion through the different layers of the rectal wall led to development of an ultrasonographic staging system, whose de-grees of invasion correspond to the pathologic stages of the TNM classification. The re-ported accuracy of TRUS for rectal cancer staging in evaluation of depth of invasion varied from 69% to 91% and accuracy in evaluation of lymph node metastasis varied from 61% to 84%. Although the accuracy of restaging after preoperative chemoradiation of rectal cancer showed a decrease up to 40%, it provides a large amount of useful information in terms of the choice of treatment modality in rectal cancer. We should understand the nature of TRUS and its limitation in diagnosis of rectal cancer.
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KEYWORD
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Transrectal ultrasonography, Rectal cancer, Staging, Re-staging, Limitation
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