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Table 2: NPC detection—grading of the previous MRI and updated diagnostic performances of the previous MRI, endoscopy, and endoscopic biopsy based on long-term outcome at 3 years in 203 patients (78 with NPC and 125 without NPC)
MRI Endoscopy Endoscopic Biopsy^{^a}
True-Positive 78 69 73
Grade 3 (n = 2); grade 4 (n = 76) 
True-Negative 115 118 125
Grade 1 (n = 32); grade 2 (n = 83) 
False-Positive 10 7 0
Grade 3 (n = 10); grade 4 (n = 0) 
False-Negative 0 9 5
Grade 1 (n = 0); grade 2 (n = 0) 
Sensitivity (%) 100 88 94
Specificity (%) 92 94 100
PPV (%) 89 91 100
NPV (%) 100 93 96
Accuracy (%) 95 92 98
Note:—PPV indicates positive predictive value; NPV, negative predictive value.
↵a Endoscopic biopsy is endoscopically directed biopsy obtained at the site of the abnormality seen at endoscopy or sampling biopsies obtained from the endoscopically normal nasopharynx.