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Glycogen storage disease type IV: a case report.
1Department of Pathology, Mackay Memorial Hospital, Taipei, Taiwan, ROC.
Zhonghua Yi Xue Za Zhi = Chinese Medical Journal; Free China Ed
|October 26, 1999
Summary
Glycogen storage disease type IV (GSD-IV) is a rare genetic disorder. This case highlights a patient with a total deficiency in glycogen branching enzyme activity, leading to abnormal glycogen accumulation.
Area of Science:
- Hepatology
- Genetics
- Biochemistry
Background:
- Glycogen storage disease type IV (GSD-IV) is a rare, inherited metabolic disorder.
- It stems from a deficiency in glycogen branching enzyme (GBE) activity.
- This deficiency leads to the formation of abnormal glycogen deposits in organs, primarily the liver.
Observation:
- A 14-month-old female presented with hypotonia and progressive hepatosplenomegaly.
- Liver biopsy revealed enlarged hepatocytes with characteristic intracytoplasmic inclusions.
- Microscopic examination showed portal fibrosis and fibrous septa, indicative of liver damage.
Findings:
- Ultrastructural analysis of inclusions identified non-membrane-bound fibrillar material.
- Enzyme assays confirmed a complete absence of glycogen branching enzyme (GBE) activity.
- These findings are consistent with a diagnosis of Glycogen storage disease type IV.
Implications:
- This case underscores the importance of GBE deficiency identification in GSD-IV diagnosis.
- Understanding the pathological features aids in managing liver disease progression.
- Further research into GSD-IV pathogenesis can inform therapeutic strategies.