Diagnosis often takes three to nine months to be made, as the condition is often unrecognised by physicians. Differential diagnosis The differential focuses on distinguishing it from similar entities such as quadrilateral space syndrome, which involves the teres minor and variably the deltoid, and suprascapular nerve impingement at the spinoglenoid notch, which predominantly involves the infraspinatus.
Parsonage–Turner syndrome
Wilson–Turner syndrome
Klinefelter syndrome
Kallmann syndrome
Smith–Magenis syndrome
Kapur–Toriello syndrome
Malouf syndrome
XYY syndrome