3-DAUS can aid significantly in the choice of surgical approach following RCT. However, a greater sample of patients is required to establish sufficiently accurate post-RCT 3-DAUS parameters.
3D-AUS was shown to evaluate accurately the response to chemoradiotherapy, helping in the selection of patients for a sphincter-saving resection. The distance between the tumour and the internal anal sphincter was the most important parameter in this respect.
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