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Journal of Clinical Neuroscience 2015-Oct

Pathological characteristics of glycogen storage disease III in skeletal muscle.

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Leah D Gershen
Brigid E Prayson
Richard A Prayson

Nøgleord

Abstrakt

We report a 25-year-old man with glycogenosis III who presented with a progressive 2 year history of fatigue, hand stiffness and cramping. The glycogenoses are a group of rare metabolic disorders which develop as a result of deficiencies in various enzymes involved in the metabolism of glycogen. Some, but not all, glycogenoses, may result in skeletal muscle pathology. Among those that result in vacuolar myopathic changes, glycogen storage disease III or debrancher enzyme deficiency, an autosomal recessive condition, is less commonly encountered than acid maltase (Type II) and myophosphorylase (Type V) deficiencies. Many patients with debrancher enzyme deficiency also have liver involvement. The neurological examination of our patient showed mild proximal limb weakness and decreased reflexes. He had elevated creatine kinase and aldolase levels. He also demonstrated some elevations in his liver function tests, suggesting possible liver involvement. A skeletal muscle biopsy demonstrated vacuolar myopathic changes (acid phosphatase negative) accompanied by focal endomysial fibrosis and chronic inflammation. An ultrastructural examination showed that his vacuoles were filled with glycogen material. An enzyme assay of skeletal muscle tissue showed a significant decrease in debrancher enzyme activity (11% of normal). We review the typical clinical presentation of patients with glycogenosis III and discuss the differential diagnoses of glycogenosis III versus the other glycogenoses resulting in vacuolar myopathy.

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