Table 4: Agreement between post-chemoradiation three-dimensional ultrasound and pathologic findings in the identification of positive and negative lymph nodes.

Pathology
Positive Negative Total
Post-chemoradiation 3D-US
     Positive 6a 4b 10
     Negative 7c 51a 58
Total 13 55 68

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