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Table 2 Diagnostic accuracy of ultrasound echogenicity compared to MRI and muscle biopsy in the Deltoid

From: Muscle B mode ultrasound and shear-wave elastography in idiopathic inflammatory myopathies (SWIM): criterion validation against MRI and muscle biopsy findings in an incident patient cohort

 

MRI muscle oedema (%)

MRI atrophy/fatty infiltration (%)

Bx-inflammation (%)

Bx-necrosis (%)

Bx-fibrosis (%)

Bx-atrophy/fatty infiltration (%)

Deltoid sensitivity

67

100

83

83

100

100

Deltoid specificity

100

75

0

0

0

0

Deltoid PPV

100

50

83

83

67

92

Deltoid NPV

50

100

0

0

0

0

Vastus lateralis sensitivity

90

83

100

100

100

100

Vastus lateralis specificity

25

13

0

0

0

0

Vastus lateralis PPV

75

42

83

83

67

92

Vastus lateralis NPV

50

50

0

0

0

0

  1. Bx: Muscle biopsy, PPV: positive predictive value, NPV: negative predictive value, MRI: magnetic resonance imaging