Table 1 Clinical features of patients with dermatomyositis

Age (at diagnosis)

54.23 years

ANA positivity

12 (40%)

Sex (female: male)

2.3:1

DM-specific antibodies (n = 17)

12 (70.5%)

Proximal muscle weakness

29 (96.7%)

Anti-Jo1 positivity (n = 28)

0

Ro52 (n = 27)

10 (37.0%)

Raynaud

2 (6.7%)

Elevated CK (n = 24)

16 (66.7%)

Dysphagia

6 (20.0%)

Arthralgia/arthritis

11 (36.7%)

Cutaneous involvement

ILD

5 (16.7%)

Heliotrope rash

27 (90.0%)

Cancer

8 (26.7%)

Gottron’s papules

6 (20.0%)

Gottron’s sign

0

Clinical diagnosis

Definite DM

14 (46.7%)

Muscle biopsy (n = 24)

Probable DM

12 (40.0%)

Endomysial inflammation

13 (54.2%)

Amyopathic DM

1 (3.3%)

Perimysial/perivascular infl

7 (29.2%)

DM sine dermatitis

3 (10.0%)

Perifascicular atrophy

16 (66.7%)

Rimmed vacuoles

1 (4.1%)

Criteria probability

High

16 (53.3%)

Medium

13 (43.3%)

Low

1 (3.3%)