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Glenoid labrum: MR imaging with histologic correlation
Radiology
|July 1, 1995
Summary
Altered signal intensity in the shoulder labrum on MRI can stem from various factors like degeneration or inflammation. A specific transitional zone in the labrum correlates with increased signal intensity, aiding diagnosis.
Area of Science:
- Orthopedic imaging
- Histopathology
- Shoulder anatomy
Background:
- Magnetic resonance (MR) imaging is crucial for evaluating shoulder pathology.
- Understanding the histopathologic basis of MR signal intensity alterations in the glenoid labrum is essential for accurate diagnosis.
Purpose of the Study:
- To correlate specific histopathologic findings with altered intralabral and sublabral signal intensity observed on MR images.
- To elucidate the causes of abnormal signal intensity within and below the glenoid labrum.
Main Methods:
- Ten fresh cadaveric shoulder specimens were imaged using various MR sequences (T1-weighted, proton-density-weighted, T2-weighted spin-echo, MPGR, 3D GRE, SPGR, fat-suppressed T1-weighted).
- Imaging was performed before and after intraarticular gadolinium injection.
- Specimens were subsequently frozen, sectioned, and histologically analyzed.
Main Results:
- Altered intralabral signal intensity was associated with fibrovascular tissue, degenerative changes (mucoid/eosinophilic), calcification, ossification, and synovial tissue.
- A sublabral transitional band of intermediate signal intensity corresponded to a fibrocartilaginous transitional zone.
Conclusions:
- Multiple histopathologic factors contribute to altered intralabral signal intensity on MR imaging.
- A transitional fibrocartilaginous zone is linked to increased sublabral signal intensity.
- Intraarticular gadolinium administration enhances the evaluation of the glenoid labrum.