Results of Reviewed MRI Parameters
| Measured result | Diagnostic odds ratio for metastasis detection* | ||||
| Parameter | 123 tumor-negative SLNs | 13 tumor-positive SLNs | Odds ratio | 95% CI | P |
| Median SLN size (mm) | |||||
| Short-axis diameter | 4.0 (range, 1.0–8.9) | 5.6 (range, 2.0–6.7) | 1.42 | 1.01–1.99 | 0.042 |
| Long-axis diameter | 7.0 (range, 1.0–14.3) | 8.2 (range, 3.7–16.0) | 1.28 | 1.03–1.57 | 0.023 |
| Ratio long relative to short axis† | 1.7 (range, 1.0–4.6) | 1.9 (range, 1.0–3.0) | 0.75 | 0.32–1.73 | 0.497 |
| SLN (%) categorized by shape‡ | |||||
| Bean | 47 (38.2%) | 3 (23.1%) | 0.45 | 0.12–1.75 | 0.250 |
| Disk | 33 (26.8%) | 6 (46.2%) | 1.98 | 0.60–6.50 | 0.262 |
| Spheric/ball | 38 (30.9%) | 3 (23.1%) | 0.83 | 0.21–3.30 | 0.795 |
| Lobulated | 5 (4.1%) | 1 (7.7%) | 2.60 | 0.27–25.46 | 0.412 |
| SLN (%) with‡ | |||||
| Absence of sharp demarcation | 4 (3.3%) | 2 (15.4%) | 7.55 | 1.09–52.28 | 0.040 |
| Heterogeneous gadolinium enhancement | 17 (13.8%) | 4 (30.8%) | 3.06 | 0.79–11.89 | 0.107 |
| Fat hilum visible | 17 (13.8%) | 1 (7.7%) | 0.60 | 0.07–5.06 | 0.637 |
| Central necrosis | 0 (0.0%) | 0 (0.0%) | Not applicable | Not applicable | Not applicable |
| Cystic component | 0 (0.0%) | 0 (0.0%) | Not applicable | Not applicable | Not applicable |
| SLN (%) categorized by cortex‡ | |||||
| Cortex cannot be discerned | 90 (73.2%) | 9 (69.2%) | 0.59 | 1.56–2.24 | 0.438 |
| Cortex < 3 mm | 29 (23.6%) | 3 (23.1%) | 1.27 | 0.31–5.29 | 0.738 |
| Cortex ≥ 3 mm | 4 (3.3%) | 1 (7.7%) | 3.79 | 0.33–43.09 | 0.282 |
| Median nearest non-SLN size (mm) | |||||
| Short-axis diameter | 3.0 (range, 1.0–9.0) | 3.5 (range, 1.0–5.2) | 1.35 | 0.95–1.92 | 0.092 |
| Long-axis diameter | 4.9 (range, 1.0–15.0) | 7.9 (range, 3.5–12.0) | 1.19 | 1.00–1.42 | 0.055 |
| Ratio short axis relative to short-axis SLN† | 1.4 (range, 0.4–5.5) | 1.3 (range, 0.6–6.0) | 1.09 | 0.63–1.88 | 0.755 |
| Ratio long axis relative to long-axis SLN† | 1.2 (range, 0.1–9.7) | 1.1 (range, 0.8–2.1) | 0.58 | 0.25–1.37 | 0.216 |