Hirayama disease (HD) or monomelic amyotrophy (MA) is a rare muscular atrophy that affects young Asian males, usually occurs in one of the upper limbs that progresses slowly. It is diagnosed by means of electromyographic/electroneurographic conduction speed studies and by magnetic resonance imaging (MRI) of the spinal cord. In this paper two different HD case is reported.
Key words: Hirayama Disease, motor neuron disease, electromyography, late on-set.
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