Abstract
Ganglion cysts around shoulder joint are often associated with vague, dull, and poorly localized shoulder pain that is worsened by overhead activity. As only 1-2% of patients with shoulder pain have neuropathy due to suprascapular nerve compression by ganglion cyst, suprascapular nerve compression is not a disease primarily suspected at outpatient clinics. Suprascapular nerve compression can occur at the suprascapular notch and/or the spinoglenoid notch. Clinical findings are usually nonspecific in the early stage of disease. However, in the late stage, denervation of the supraspinatus and infraspinatus muscles can occur due to suprascapular nerve compression at the suprascapular notch. If nerve compression occurs at the spinoglenoid notch, only the infraspinatus muscle becomes denervated. Patients may present with abduction and external rotation weakness depending on the degree and the duration of nerve compression.
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