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Localization and quantitative assessment of inflammation in frozen shoulder: a PET/MRI fusion imaging analysis.

New research · Radiology

Skeletal radiology · 2mo

StudySkeletal radiology· Aug 2026

Localization and quantitative assessment of inflammation in frozen shoulder: a PET/MRI fusion imaging analysis.

Rei Kimura, Nobuyuki Yamamoto, Yusuke Koibuchi … Toshimi Aizawa

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Nuclear & Molecular ImagingStudyQ2IF 2.6

Inflammation in frozen shoulder concentrates at the anterosuperior and anteroinferior glenoid labrum.

Localization and quantitative assessment of inflammation in frozen shoulder: a PET/MRI fusion imaging analysis.

Rei Kimura … Toshimi Aizawa

Skeletal radiology · Aug 2026 · Q2 in Radiology

Background

Frozen shoulder is a common clinical condition; however, its pathophysiology and precise anatomical localization of inflammatory activity remain unclear.

Methods

Seven patients with frozen shoulder who underwent 18F-FDG PET/CT were analyzed (2 men, 5 women; mean age, 59 years), all in the freezing phase.

n = 5 women

ρ = -0.709

Results

ρ = -0.709

inflammation intensity fell sharply with distance from the labrum

n = 5 women

More results

The mean SUVmax of the asymptomatic shoulder was 1.6 ± 0.3.

SUVmax was highest in the anterosuperior and anteroinferior labrum.

FDG uptake was most consistently observed at the glenoid labrum, which showed the highest SUVmax in all patients.

“

Conclusion

These findings provide insight into disease mechanisms and support further imaging studies focusing on the labrum.

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