TABLE 3.
Anatomic, Metabolic, and Functional Features of PNSTs in SWN
| Anatomic imaging features (n = 153) | ||
|---|---|---|
| Sizea | 2.3 cm (1–24.3 cm) | |
| Margin | ||
| • Well defined | 94% (143/149) | |
| • Partly well defined | 3% (5/149) | |
| • Ill defined | 1% (1/149) | |
| T1-W | ||
| • Signal characteristics | ||
| ○ Hypointense | 1% (1/149) | |
| ○ Isointense | 99% (148/149) | |
| ○ Hyperintense | 0% | |
| • Heterogeneity | ||
| ○ < 25% | 99% (148/149) | |
| ○ 25–75% | 1% (1/149) | |
| ○ > 75% | 0% | |
| STIR | ||
| • Signal characteristics | ||
| ○ Hypointense | 0% | |
| ○ Isointense | 0% | |
| ○ Hyperintense | 100% (149/149) | |
| • Heterogeneity | ||
| ○ < 25% | 19% (28/149) | |
| ○ 25–75% | 66% (99/149) | |
| ○ > 75% | 15% (22/149) | |
| T1W +C Enhancement | ||
| ○ < 25% | 19% (23/123) | |
| ○ 25–75% | 22% (27/123) | |
| ○ > 75% | 59% (73/123) | |
| Target sign on STIR | ||
| • Absent | 33% (34/149) | |
| • Present | 77% (115/149) | |
| Tail sign | ||
| • Absent | 64% (96/149) | |
| • Present | 36% (53/149) | |
| Split fat sign | ||
| • Absent | 4% (6/149) | |
| • Present | 96% (143/149) | |
| Relationship of lesion to parent nerve | ||
| • Central | 2% (3/149) | |
| • Eccentric | 33% (50/149) | |
| • Indeterminate | 65% (96/149) | |
| Functional imaging features (n = 98) | ||
| ADC values (×10−3 mm2/s) | ||
| • Minimuma | 1.7 (0.3–2.2) | |
| • Averagea | 2.1 (0.9–2.9) | |
| • Maximuma | 2.5 (1–4.8) | |
| Target Sign | ||
| • Absent | 80% (78/98) | |
| • Present | 20% (20/98) | |
| Metabolic imaging features (n = 15) | ||
| SUVmax – Earlya | 6 (2.1–11.7) | |
| SUVmax – Delayeda | 10 (2.7–15.3) | |
a
Median values are provided with range in parentheses (averaged for both readers).