TY  - JOUR
T1  - Shoulder Impingement Syndrome Due to a Ganglion Cyst Below the Coracoacromial LigamentA Case Report
AU  - Terabayashi, Nobuo
AU  - Fukuta, Masashi
AU  - Ito, Yoshiki
AU  - Takigami, Iori
AU  - Nishimoto, Yutaka
AU  - Shimizu, Katsuji
Y1  - 2011/04/20
N1  - 10.2106/JBJS.J.00810
JO  - The Journal of Bone & Joint Surgery
SP  - e36 1
EP  - 5
VL  - 93
IS  - 8
N2  - 
Young athletes who employ overhead arm movements frequently develop shoulder pain caused by muscle tightness or scapula dysfunction1-3. Generally, they are instructed to perform a stretching and muscle-conditioning regimen1,3, but refractory pain without muscle tightness sometimes persists. In such cases, magnetic resonance imaging (MRI) should be used to look for other lesions, and occasionally a cystic lesion may be identified. Cysts located near the labrum, referred to as paralabral cysts or labral cysts, may cause shoulder pain or suprascapular nerve palsy4,5. To our knowledge, there have been no previous reports of ganglion cysts that were located below the coracoacromial ligament as being the cause of shoulder impingement syndrome in athletes. We report the presence of such a cyst in a patient who had the typical symptoms of shoulder impingement syndrome. For diagnostic imaging, we carried out radiographs, MRI, ultrasonography, and cystographic three-dimensional computed tomography (CT) examinations. Ultrasonography was particularly helpful for understanding the movement of the ganglion, while shoulder-dynamic and cystographic three-dimensional CT was very useful for identifying the location of the stalk and estimating the size of the cyst. Our patient was informed that data concerning the case would be submitted for publication, and he consented.

SN  - 0021-9355
M3  - doi: 10.2106/JBJS.J.00810
UR  - http://dx.doi.org/10.2106/JBJS.J.00810
ER  -