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 52a 8b 60
     Complete response 1c 7c 8
Total 53 15 68

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