- Clinical features of the patients (N=26).
| Characteristic | n | % |
| Painless muscle weakness | 25 | 96.2 |
| Gottron’s papules | 9 | 56.3 |
| Heliotrope rash | 7 | 43.8 |
| Dysphagia | 10 | 38.5 |
| Arthritis | 7 | 26.9 |
| Mechanics hands | 4 | 25.0 |
| V sign | 3 | 18.8 |
| Shawl sign | 3 | 18.8 |
| Raynaud’s phenomenon | 2 | 12.5 |
| Holster sign | 0 | 0.0 |
| Cuticular overgrowth | 0 | 0.0 |
| Periungual erythema | 0 | 0.0 |
| Malignancy | 0 | 0.0 |
| Lung disease | ||
| No involvement | 9 | 69.2 |
| Mild interstitial lung disease | 2 | 15.4 |
| No interstitial lung disease | 1 | 7.7 |
| Interstitial lung disease | 1 | 7.7 |