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Table 2: Diagnostic accuracy of contrast-free and postgadolinium sessions
First Raters Group Second Raters Group
Contrast-Free Session Postgadolinium Session Contrast-Free Session Postgadolinium Session
Region extension Se Sp Se Sp Se Sp Se Sp
Median line involvement 0.67 0.96 0.67 0.95 0.83 0.95 0.83 0.95
Vascular extension 0 1 0 1 1 0.93 1 0.93
Mandibular cortical bone 0.9 0.95 0.9 0.95 0.9 0.95 0.9 0.95
Mandibular medullary bone 0.88 0.9 0.88 0.9 0.88 0.9 0.88 0.9
Intermaxillary commissure 1 0.91 1 0.86 1 0.95 1 0.89
Vestibule 0.92 1 0.92 1 0.92 1 0.92 1
Skin 0.67 1 1 1 0.67 0.92 0.67 1
Mobile tongue 0.8 1 0.8 1 0.67 1 0.67 1
Palatoglossal arch 0.67 1 0.33 1 1 0.96 0.67 1
Palatine tonsil 1 0.92 1 0.92 1 1 0.5 1
Floor of mouth 0.78 0.94 0.78 0.94 0.89 1 0.89 1
Submandibular glands 1 0.9 1 0.9 1 1 1 1
Soft palate 0.67 0.96 0.67 1 1 0.81 1 0.81
Hard palate 1 1 1 1 1 0.96 1 0.96
Maxillary bone 1 0.96 1 0.96 1 0.92 1 0.92
Maxillary sinus 1 0.96 1 0.96 1 0.96 1 0.96
Masseter muscle 1 0.96 1 0.96 1 0.96 1 1
Pterygoid muscles 1 0.89 1 0.92 1 0.88 1 0.88
Nasal fossa 1 1 1 1 0.5 0.96 1 0.96
Subarachnoid spaces 1 1 1 1 1 1 1 1
Parotid glands 0 1 1 1 1 1 0 1
Perineural extension (V) 1 1 1 1 1 0.96 1 0.96
Perineural extension (VII) 0 1 0.5 1 1 1 1 1
All locations 0.83 0.98 0.85 0.98 0.88 0.98 0.9 0.98
All locations T1-T2 0.79 0.99 0.79 0.99 0.79 0.98 0.89 0.98
Note:—Se indicates sensitivity; Sp, specificity.