Case Study 213 | Parsonage–Turner Syndrome A patient presents with sudden, severe shoulder pain - often described as deep, burning, or electric - followed days to weeks later by weakness and muscle atrophy in the shoulder or arm. This pattern is classic for Parsonage–Turner syndrome, an inflammatory brachial plexopathy that is frequently misdiagnosed as a rotator cuff injury, cervical radiculopathy, or frozen shoulder. Key teaching points: • Pain is acute and intense at onset, then improves as w