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Table 2 Semi-quantitative results of MRI evaluation for each muscle group in Pompe disease

From: 2-deoxy-2-[18]fluoro-D-glucose PET/CT (18FDG PET/CT) may not be a viable biomarker in Pompe disease

Muscle

T1w

(Median)

T1w

(IQRa)

STIR

(Median)

STIR

(IQRa)

T1 FS CE (Median)

T1 FS CE (IQRa)

Intrinsic back muscles (lower back)

3.0

3.0–3.0

0.0

0.0–3.0

0.0

0.0–3.0

Iliopsoas

2.0

0.5–3.5

1.0

0.0–2.5

1.5

0.0–2.5

Gluteus maximus (lateral)

2.0

0.5–4.0

1.0

0.0–2.0

1.5

0.5–2.0

Gluteus maximus (center)

0.0

0.0–1.5

0.0

0.0–1.5

0.0

0.0–1.5

Gluteus maximus (medial)

1.5

0.0–3.0

1.0

0.0–2.0

1.0

0.0–2.5

Gluteus medius (ventral)

2.0

1.0–3.5

1.5

1.0–2.0

2.0

1.0–3.5

Gluteus medius (dorsal)

3.5

1.5–4.0

1.0

0.0–1.5

0.5

0.0–1.5

Gluteus minimus (ventral)

4.0

3.5–4.0

0.5

0.0–1.5

0.5

0.0–1.5

Gluteus minimus (dorsal)

4.0

3.5–4.0

0.5

0.0–1.5

0.5

0.0–1.5

Rectus femoris

0.0

0.0–0.0

0.0

0.0–0.0

0.0

0.0–0.0

Sartorius

0.0

0.0–0.0

0.0

0.0–0.0

0.0

0.0–0.0

Obturator ext.

1.0

0.5–2.0

0.0

0.0–0.5

0.0

0.0–0.5

Pectineus

0.0

0.0–2.5

0.0

0.0–0.0

0.0

0.0–0.0

  1. aInterquartile range
  2. T1 images were scored according to a 5-grade score (grade 0: normal, grade 1: < 25%; grade 2: > 25% and < 50%; grade 3: > 50% and < 75%; grade 4: > 75%). STIR and T1w fat-sat contrast-enhanced (CE) images were scored according to a 5-grade score (grade 0: no hyperintensities, grade1: mild; grade 2: moderate; grade 3: intermediate; grade 4: severe amount of hyperintensities)