Microscopic examination of musculus gastrocnemius biopsies was made in four cases of sporadic lateral amyotrophic sclerosis (LAS). The validity of the clinical diagnosis was confirmed by detected neurotrophic atrophy of the muscular fibers typical for LAS. Electron microscopic study revealed virus-like inclusions 200-450 nm in size in sarcoplasm of myocytes of all the patients. The inclusions consist of lined cells of hexagonal shape at the distance of 37-41 nm from each other. The inclusions resemble enteroviruses but are not identical to them both by size and structure of their elements. There were also specific ultrastructural changes of myocytes corresponding to viral infection. The above virus-like inclusions should be considered as specific structures formed as a result of metabolic shifts caused by productive action on the cell of infective or unknown factor.
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