Table 4 Diagnostic performance of MRI and MRV findings in discriminating IIH cases from control
| Â | TP | FP | TN | FN | SN | SP | PPV | NPV | Accuracy |
|---|---|---|---|---|---|---|---|---|---|
MRI findings | |||||||||
1- Decrease pituitary gland height | 29 | 3 | 31 | 5 | 85.2% | 91.2% | 90.6% | 86.1% | 88.2% |
2- Flattened posterior globe | 26 | 0 | 34 | 8 | 76.4% | 100% | 100% | 80.9% | 88.2% |
3- Optic-nerve sheath distention | 29 | 3 | 31 | 5 | 85.2% | 91.1 | 90.6% | 86.1% | 88.2% |
4-Optic nerve tortuosity | 9 | 0 | 34 | 25 | 26.5% | 100% | 100% | 57.6% | 63.2% |
Combined MRI findings (presence of 3 or more MRI findings) | 29 | 0 | 34 | 5 | 85.2% | 100% | 100% | 87.1% | 92.2% |
MRV findings | |||||||||
Transverse/sigmoid sinus patency | |||||||||
• Unilateral stenosis vs. normal | 11 | 4 | 30 | 8 | 57.9% | 88.2% | 73.3% | 78.9% | 77.3% |
• Bilateral stenosis vs. normal | 15 | 0 | 33 | 8 | 65.2% | 100% | 100% | 80.5% | 85.7% |
• Abnormal vs. normal | 26 | 4 | 30 | 8 | 76.5% | 88.2% | 86.6% | 78.9% | 82.3% |
Combined conduit score (CCS) | 29 | 2 | 32 | 5 | 85.3% | 94.1% | 93.5% | 84.2% | 89.7% |