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Familial Chiari Malformation: Prevalence of Connective Tissue Disorders and Other Comorbidities

Anne Heukwa-Tefoung1, Alicia Bui1, Holly Gilmer2

  • 1William Beaumont School of Medicine, Oakland University, Rochester , Michigan , USA.

Neurosurgery
|July 22, 2026
PubMed

Insights

Familial Chiari malformation type 1 (CM-I) is linked to connective tissue disorders (CTDs), especially Ehlers-Danlos syndrome (EDS). This highlights the importance of family history and connective tissue evaluation in CM-I patients.

Area of Science:

  • Neurology
  • Genetics
  • Rheumatology

Background:

  • Chiari malformation type 1 (CM-I) frequently co-occurs with connective tissue disorders (CTDs), notably Ehlers-Danlos syndrome (EDS).
  • The familial prevalence of CM-I and CTDs is not well-understood, impacting risk assessment and management.

Purpose of the Study:

  • To investigate the prevalence of CTDs and associated comorbidities in family members of CM-I patients.
  • To compare these prevalences between familial and sporadic CM-I cases.

Main Methods:

  • Retrospective survey of 890 CM-I patients who underwent posterior fossa decompression.
  • Analysis of 354 complete responses regarding family history of CM-I, CTDs, and comorbidities.
  • Stratification into familial and sporadic groups for comparative analysis using chi-squared or Fisher exact tests.

Main Results:

  • 87% of respondents reported a family history of CM-I.
  • Familial CM-I cases showed significantly higher rates of joint issues, easy bruising, and CTDs (especially EDS) compared to sporadic cases.
  • Familial CM-I patients reported more hyperflexibility, postural orthostatic tachycardia syndrome, and mast cell activation disorder.

Conclusions:

  • A strong heritable link exists between familial CM-I and CTDs, including EDS and systemic comorbidities.
  • Detailed family history and connective tissue evaluations are crucial for CM-I patients.
  • Screening at-risk relatives can improve diagnosis, surgical planning, and patient outcomes.
Abstract

Keywords:
Chiari malformationComorbiditiesConnective tissue disordersEhlers-Danlos syndrome

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