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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