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Table 4 Wall invasion by inferior vena cava thrombus on MRI versus invasion determined at surgery

From: Renal cell carcinoma with venous extension: prediction of inferior vena cava wall invasion by MRI

Observer 1 MRI

Surgery

Wall invasion

Absence of wall invasion

Wall invasion

24

1

Absence of wall invasion

2

21

Observer 2 MRI

Surgery

Wall invasion

Absence of wall invasion

Wall invasion

25

3

Absence of wall invasion

1

19

Observers 1 + 2 MRI

Surgery

Wall invasion

Absence of wall invasion

Wall invasion

24

3

Absence of wall invasion

2

19

  1. In three cases, the two observers assessed the presence or absence of invasion differently. In case of a differing assessment, the opposite of the reference standard (intraoperative finding) was assumed in order to avoid an overestimation of the diagnostic performance. This combined assessment (observers 1 + 2) is shown below