| 1
|
Macules and papules with erythema and violaceous discoloration on the eyelids, proximal interphalangeal joints and metacarpophalangeal joints. |
| 2 |
Positive muscle biopsy |
| 3 |
Elevation of muscle enzymes |
| 4 |
EMG evidence with a triad of: |
| a) short small polyphasic motor units |
| b) fibrillation, positive sharp waves, insertional irritability |
| 5 |
Proximal muscle weakness |
| |
Possible DM = rash + 1 other
Probable DM = rash + 2 other
Definite DM = rash + 3 other |
