Association of each SWI signal category with the presence or absence of gadolinium enhancementa
| SWI Signal | Sensitivity | Specificity | PPV | NPV | P |
|---|---|---|---|---|---|
| Association with Gd– | |||||
| Hypointense rings | 37.5% (29.6%–46.1%) | 90.2% (77.5%–96.1%) | 92.3% (81.8%–97.0%) | 31.6% (23.9%–40.5%) | <.001 |
| Marked hypointensity | 66.4% (57.9%–74.0%) | 92.7% (80.6%–97.5%) | 96.6% (90.5%–98.8%) | 46.9% (36.4%–57.7%) | <.001 |
| Hypointense rings or marked hypointensity | 93.0% (87.2%–96.3%) | 82.9% (68.7%–91.5%) | 94.4% (89.0%–97.3%) | 79.1% (64.%8–88.6%) | <.001 |
| Association with Gd+ | |||||
| Mild hypointensity | 24.4% (13.8%–39.3%) | 99.2% (95.7%–99.9%) | 90.9% (62.3%–98.4%) | 80.4% (73.5–85.8%) | <.001 |
| Iso-/hyperintensity | 43.9% (29.9%–59.0%) | 100.0% (97.1%–100.0%) | 100.0% (82.4%–100.0%) | 84.8% (78.2%–89.6%) | <.001 |
| Mild hypointensity or iso-/hyperintensity | 68.3% (53.0%–80.4%) | 99.2% (95.7%–99.9%) | 96.6% (82.8%–99.4%) | 90.7% (84.8%–94.5%) | <.001 |
Note:—PPV indicates positive predictive values; NPV, negative predictive values.
↵a Numbers in parentheses represent 95% confidence intervals. P values are Fisher exact test P values.