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Table 3: Diagnostic performance of individual MR imaging findings for the diagnosis of meningitis^{^a}
MR Imaging Findings Sensitivity Specificity PPV NPV Accuracy
Leptomeningeal enhancement 73.3% (62.6%–82.2%) 78.1% (78.1%–99.9%) 98.4% (90.2%–99.7%) 48.9% (40.0%–57.8%) 78.0% (69.0%–85.4%)
Ventriculitis 13.8% (7.3%–22.9%) 100% (84.6%–100%) 100% (100%) 22.7% (21.2%–24.2%) 31.2% (22.7%–40.8%)
Cerebritis 28.7% (19.5%–39.4%) 100% (84.6%–100%) 100% (100%) 26.2% (23.7%–28.9%) 43.1% (33.7%–53.0%)
Infarct 43.7% (33.1%–54.7%) 100% (84.6%–100%) 100% (100%) 31.0% (27.2%–35.1%) 55.1% (45.2%–64.6%)
Extra-axial purulent material 32.6% (22.8%–43.5%) 95.7% (78.1%–99.9%) 96.6% (80.1%–99.5%) 27.5% (24.2%–31.0%) 36.3% (36.3%–55.7%)
Intraventricular purulent material 13.8% (7.3%–22.9%) 100% (84.6%–100%) 100% (100%) 22.7% (21.2%–24.2%) 31.2% (22.7%–40.8%)
Abscess/granuloma 2.3% (0.28%–8.1%) 100% (84.6%–100%) 100% (100%) 20.6% (20.0%–21.1%) 22.0% (14.7%–31.0%)
↵a Numbers in parentheses are 95% confidence intervals. Data were obtained from brain MRIs within 7 days of presentation.