Ann Rehabil Med.  2015 Oct;39(5):848-852. 10.5535/arm.2015.39.5.848.

Type 2 Superior Labral Anterior to Posterior Lesion-Related Paralabral Cyst Causing Isolated Infraspinatus Paralysis: Two Case Reports

• Lee YK
• Han EY
• Choi SW
• Kim BR
• Suh MJ

• KMID: 2148219
• DOI: http://doi.org/10.5535/arm.2015.39.5.848

Abstract

Type 2 superior labral anterior to posterior (SLAP) lesion is a common cause of shoulder pain requiring surgical operation. SLAP tears are often associated with paralabral cysts, but they rarely cause nerve compression. However, we experienced two cases of type 2 SLAP-related paralabral cysts at the spinoglenoid notch which were confirmed as isolated nerve entrapment of the infraspinatus branch of the suprascapular nerve by electrodiagnostic assessment and magnetic resonance imaging. In these pathological conditions, comprehensive electrodiagnostic evaluation is warranted for confirmation of neuropathy, while surgical decompression of the paralabral cyst combined with SLAP repair is recommended.

Keyword

Shoulder pain; Electromyography; Ganglion cysts; Nerve compression syndromes

MeSH Terms

Decompression, Surgical
Electromyography
Ganglion Cysts
Magnetic Resonance Imaging
Nerve Compression Syndromes
Paralysis*
Shoulder Pain
Tears

Figure

• 

  Fig. 1 (A) Coronal oblique T2-weighted magnetic resonance imaging shows paralabral cyst (arrow) extending to the suprascapular notch. (B) Sagittal oblique T2-weighted magnetic resonance imaging shows fatty atrophy of the infraspinatus muscle (I), compressed by a paralabral cyst (arrow). D, deltoid; Sub, subscapularis; S, supraspinatus; T, teres minor.

• 

  Fig. 2 (A) Sagittal oblique T2-weighted magnetic resonance imaging shows paralabral cyst (arrow) at the suprascapular notch and slightly high signal intensity of the infraspinatus muscle (I). (B) Axial T2-weighted magnetic resonance imaging reveals paralabral cyst (arrow). D, deltoid; Sub, subscapularis; S, supraspinatus; T, teres minor.

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