[Hiramaya disease: disease or syndrome?]

Hirayama's disease, a benign juvenile amyotrophy of "oblique" topography of an upper limb, has been acknowledged in the international literature. 4 cases are reported in this paper. However there present some differences: presence of antigangliosides antibodies in 1 case, cryoglobulinemia in another case developing bilaterally, conduction blocks in a third case. Finally, in the patient illustrating the typical form, the neuroradiological abnormalities considered as characteristic of cervical spine compression by Hirayama are lacking.