MRI Shoulder Paralabral Cysts, Denervation and Parsonage Turner Syndrome

On MRI muscles around the shoulder can show features of denervation. So what are the causes and what does it  look like. Most commonly its due to nerve compression from a paralabral cyst secondary to a labral tear ( usually a SLAP tear).  It can also be due to brachial neuritis ( Parsonage Turner Syndrome) …

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