Search for: [Abstract = "A 4\-year\-old patient with suspicion of spinal muscular atrophy was examined. A quadriceps biopsy was performed. Electronmicroscopy analysis of the biopsy revealed single fibers of the diameter characteristic for age and unchanged structure. Small diameter fibers with the features of the myotube with centrally located, single nuclei predominate. A massive accumulation of connective and adipose tissue between the fibers was observed.Microscopic image of the biopsy suggests the arrest of fiber development in the early stage of myogenesis"]

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