Table 4. Comparison of the N staging performed by histopathology and DW-MRI.

Diagnosis at DW-MRI	Diagnosis at histopathological examination					Total
	pN0	pN1	pN2	N3a	N3b
N0	2	3	2	0	0	7
N1	3	0	0	3	0	6
N2	0	1	0	4	2	7
N3a	0	0	0	1	2	3
N3b	0	0	0	0	0	0
Total	5	4	2	8	4	23

DW-MRI, diffusion weighted magnetic resonance imaging.