Facioscapulohumeral muscular dystrophy (FSHD) is the third most common inherited myopathy, with an estimated frequency of 1 in 25,000 [1]. Its transmission is autosomal dominant. Clinical presentation typically starts with facial and shoulder girdle weakness, followed by the trunk and leg muscles [2], caused by muscle atrophy and fatty infiltration [3]. Respiratory impairment has been described in most severe and childhood forms, and is characterized by a flat flow-volume curve, with a pronounced modification of expiratory curve [4].

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