Intramuscular ganglion cyst

Spectrum of
MRI features of ganglion and synovial cysts. a, b. Intramuscular infraspinatus cyst in a 58-year-old woman with a known partial-thickness supraspinatus tear, presenting with exacerbated posterior right shoulder pain during elevation and external rotation. Axial FS T2-weighted MRI (a) shows a teardrop-shaped homogeneously hyperintense subaponeurotic intramuscular lesion along the posterior surface of the scapula. Note its thin extension toward the musculotendinous junction (arrow). The glenoid labrum (dashed arrow) seems preserved. A sagittal section (b) better demonstrates the location of this lesion within the infraspinatous muscle. Scp, scapula; Isp, infraspinatous
insightsimaging.springeropen.com • Open Access
Intramuscular
ganglion cyst • Intramuscular cyst secondary to rotator cuff tear - Ganzer Fall bei Radiopaedia
Patel M, Intramuscular cyst secondary to rotator cuff tear. Case study, Radiopaedia.org (Accessed on 21 Dec 2022) https://doi.org/10.53347/rID-89549 • CC by-nc-sa 3.0 (modified)
Radiopaedia • CC-by-nc-sa 3.0 • de

Intramuscular ganglion cysts are a location specific subtype of ganglion cysts. They can occur at any location but have been reported in the shoulder, elbow and hand.

Differential diagnosis

At certain sites (shoulder) consider intramuscular cysts associated with rotator cuff tears.