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Table 1 Specificity and sensitivity of CT investigation for tumors of the parotid gland (n = 106). The variables investigated: (1) tumor location in the superficial lobe (yes/no), (2) tumor location in the deep lobe (yes/no), (3) encapsulation of the tumor (yes/no), and (4) progression into the parapharyngeal space (yes/no)

From: Correlation between preoperative predictions and surgical findings in the parotid surgery for tumors

Variable

TP

FP

TN

FN

specificity

sensitivity

Location: superficial lobe

      

Facial nerve line

87

3

5

11

0.88

0.94

Utrecht line

56

7

7

36

0.5

0.6

The Conn’s arc

55

8

6

37

0.57

0.59

Retromandibular vein

64

7

7

28

0.5

0.69

Location: deep lobe

      

Facial nerve line

5

3

89

9

0.84

0.36

Utrecht line

6

8

84

8

0.79

0.43

The Conn’s arc

7

5

87

7

0.82

0.5

Retromandibular vein

9

10

82

5

0.77

0.64

Encapsulation

101

0

4

1

0.95

0.99

parapharyngeal space

4

2

97

3

0.8

0.95

  1. Abbreviations: TP true positive, FP false positive, TN true negative, FN false negative