This report is of an atypical case of neuralgic amyotrophy with a Horner's syndrome, bilateral brachial plexus, lumbar plexus and phrenic nerve involvement. The diagnosis is confirmed based on a classical history and examination findings with typical neurophysiological investigations for this condition. This report also highlights the novel use of positional magnetic resonance imaging to investigate patients with respiratory muscle weakness. This case report expands the recognised clinical features of neuralgic amyotrophy and the literature concerning atypical features of this condition is reviewed.
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