Agreement between three-dimentional ultrasound 50-60 days after completion of neoadjuvant chemoradiotherapy and pathologic identification of residual tumor or complete response in the rectal wall.

Table 3: Agreement between three-dimentional ultrasound 50-60 days after completion of neoadjuvant chemoradiotherapy and pathologic identification of residual tumor or complete response in the rectal wall.

	Pathologic analysis
	Residual tumors in the rectal wall	Complete response	Total
Post-chemoradiation 3D-US
Residual tumor	52^a	8^b	60
Complete response	1^c	7^c	8
Total	53	15	68

3D-US: three-dimensional ultrasound.
^aConcordant findings; ^bOverstaging with 3D-US; ^cUnderstaging with 3D-US.