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Published online by Cambridge University Press: 01 August 2014
The identity of an autosomal recessive form of chronic spinal muscular atrophy with clinical features intermediate between acute Werdnig-Hojfmann disease and Kugelberg-Welander disease is confirmed. This form accounts for the majority of patients with spinal muscular atrophy surviving into adult life. Spinal muscular atrophy with onset after 2 years of age is a heterogeneous group and both autosomal recessive and autosomal dominant forms occur.