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Gyrate atrophy of the choroid and retina with hyperornithinemia

Tubular aggregates and type 2 fiber atrophy in muscle

Children's Hospital, University of Helsinki, Helsinki, Finland.

We studied 21 patients with gyrate atrophy of the choroid and retina and hyperornithinemia. Although the patients were not weak, type 2 muscle fibers were almost universally atrophic and had tubular aggregates. Gyrate atrophy is the first disease in which females are shown to have tubular aggregates; the sexes were affected equally. In gyrate atrophy the number of type 2 fibers decreases with age. The muscle and eye changes are probably related to abnormal creatine synthesis, caused, in gyrate atrophy, by the increased body pool of ornithine; muscle abnormalities may also be present in other tapetoretinal dystrophies.

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