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A valuable non‐invasive diagnostic investigation for paediatric idiopathic brachial neuritis

Idiopathic brachial neuritis (idiopathic neuralgic amyotrophy) in children is a well‐recognized but rare condition. Although the precise aetiology is unknown, its usual occurrence after an infection suggests an immunological process. There is no specific test for brachial neuritis, and the diagnosis is one of exclusion with supportive evidence from nerve conduction studies, electromyography (EMG), and, in adults, changes in affected muscles on magnetic resonance imaging. Young children are often unable to tolerate EMG.