Table 1.

Clinical and pathological tumor stages

Tumor stage	Clinical stage “cT” (sonography)	Pathological stage “pT” (histology)	Accordance	Underdiagnosis	Overdiagnosis
1a	72 (2.9%)	89 (3.6%)	55 (76.4%)	17 (23.6%)	0
1b	359 (14.5%)	368 (14.9%)	274 (76.3%)	64 (17.8%)	21 (5.8%)
1c	1146 (46.2%)	979 (39.5%)	823 (71.8%)	239 (20.9%)	84 (7.3%)
2	864 (34.9%)	972 (39.2%)	715 (82.8%)	37 (4.3%)	112 (13%)
3	37 (1.5%)	68 (2.7%)	29 (78.4%)	0	8 (21.6%)
4	0	2 (0.1)
total	2478 (100%)	2478 (100%)

Numbers are presented as frequencies (= n) and percentages (%). Accordance of tumor stage, underdiagnosis and overdiagnosis refers to clinical stage “cT”