Histological features of SLE myopathy muscle biopsies (n=16)
| ID | ENMC diagnosis | Necrosis/regeneration | Perifascicular atrophy | Primary inflammation | Endomysial inflammation | Perimysial inflammation |
| 1 | DM | + | + | + | − | − |
| 2 | DM | + | + | + | + | + |
| 3 | DM | + | + | − | + | − |
| 4 | DM | + | + | − | + | + |
| 5 | DM | − | + | − | + | + |
| 6 | DM | + | + | + | + | − |
| 7 | PM | + | − | + | + | + |
| 8 | NM | + | − | − | − | − |
| 9 | NM | + | − | − | − | − |
| 10 | NM | + | − | − | − | − |
| 11 | NM | + | − | − | − | − |
| 12 | NM | + | − | − | − | − |
| 13 | NM | + | − | − | − | − |
| 14 | NM | + | − | − | − | − |
| 15 | NM | + | − | − | − | − |
| 16 | Normal | − | − | − | − | − |
DM, dermatomyositis; ENMC, European NeuroMuscular Centre; ID, identification; NM, necrotising myopathy; PM, polymyositis.