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Hirayama disease is a rare, lower cervical myelopathy affecting young adults. It is responsible for pure distal motor impairment of the upper limbs, with slow progressive development in the metameric territories of C7 to T1. It is thought to be caused by movements involved in flexing the neck. Neutral position magnetic resonance imaging (MRI) looks for abnormal cervical curvature, atrophy with flattening...
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