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Alexander disease

Last edited: 4/16/2026

Overview

Alexander disease is a rare, progressive neurodegenerative disorder characterized by the accumulation of Rosenthal fibers in astrocytes, leading to white matter damage and clinical manifestations that can include megalencephaly, developmental delay, and increased intracranial pressure 1.

Diagnosis

  • Key Diagnostic Criteria: Recognition of abnormal cerebral tissue patterns indicative of white matter abnormalities.
  • Recommended Tests: Cranial ultrasound can detect megalencephaly and abnormal tissue patterns, potentially aiding early diagnosis 1.
  • Imaging: MRI is crucial for definitive diagnosis, showing characteristic white matter lesions [Not explicitly stated but implied as standard practice].
  • Biopsy: Histopathological examination may be necessary for definitive diagnosis, revealing Rosenthal fiber accumulation [Not explicitly stated but implied as standard practice].

    • Management

  • First-Line Treatments: Currently, no specific pharmacological treatments exist; management focuses on supportive care [Not explicitly stated but inferred from lack of treatment recommendations].
  • Adjunctive Therapies: Management includes addressing symptoms such as increased intracranial pressure with appropriate interventions (e.g., shunting) [Not explicitly stated but inferred from clinical context].
  • Supportive Care: Includes physical, occupational, and speech therapy tailored to individual needs [Not explicitly stated but inferred from clinical context].

    • Special Populations

  • Pediatrics: Early recognition through cranial ultrasound can be particularly beneficial in infants presenting with megalencephaly 1.

    • Key Recommendations

  • Utilize cranial ultrasound as an adjunct diagnostic tool, especially in infants with megalencephaly, to identify potential Alexander disease 1 (Evidence: Moderate).
  • Confirm diagnosis primarily through MRI and histopathological examination to visualize characteristic white matter lesions and Rosenthal fibers [Not explicitly stated but inferred] (Evidence: Expert opinion).
  • Focus on supportive care and symptom management tailored to individual patient needs, given the lack of specific pharmacological treatments [Not explicitly stated but inferred] (Evidence: Expert opinion).

    • References

    1 Harbord MG, LeQuesne GW. Alexander's disease: cranial ultrasound findings. Pediatric radiology 1988. link

    Original source

    1. [1]
      Alexander's disease: cranial ultrasound findings. — Harbord MG, LeQuesne GW Pediatric radiology (1988)
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