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Table 2: Diagnostic accuracy of MR imaging in the detection of abscesses and deep extension (parapharyngeal, retropharyngeal involvement) in the abscesses^{^a}
MRI Operation
Yes No
Abscess 
 Yes 96 2
 No 2 19^{^b}
Deep extension 
 Yes 36 5
 No 6 57
↵a Sensitivity, 0.98; specificity 0.90; PPV, 0.98; negative predictive value, 0.90; accuracy, 0.97. In the complications, sensitivity, 0.88; specificity, 0.90; PPV, 0.86; negative predictive value, 0.92; accuracy 0.89.
↵b Conditions of 4 patients were surgically confirmed, and the diagnoses of 15 patients were based on clinical assessment.