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Clinical characteristics of all patients.
| Group A | Group B | |
|---|---|---|
| Gender (F/M) | 6/20 | 3/7 |
| Age (years) | 38.4 ± 11.5 | 36.1 ± 12.0 |
| Metallic FB | 23 | 0 |
| Nonmetallic FB | 2 | 9 |
| Mixed FB | 1 | 0 |
| H signal | 24 | 7 |
| L signal | 2 | 3 |
| Clear boundary | 25 | 3 |
| Blurred boundary | 1 | 7 |
| Central shadowing | 24 | 6 |
| Marginal shadowing | 2 | 3 |
| Direct location | 2 | 10 |
| Indirect location | 24 | 0 |
