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Prevalence and Impact of Underlying Diagnosis and Comorbidities on Chiari 1 Malformation
Brooke Sadler1, Timothy Kuensting1, Jennifer Strahle2
1Department of Neurology, Washington University in St. Louis, St Louis, Missouri.
Insights
Chiari malformation type 1 comorbidities impact syringomyelia and surgery. Evaluating growth, scoliosis, and hypermobility aids in risk assessment for patients with Chiari malformation type 1.
Area of Science:
- Neurology
- Pediatric Neurology
- Medical Imaging
Background:
- Chiari malformation type 1 is a common neurological disorder, affecting 1 in 100 radiographically but only 1 in 1,000 symptomatically.
- Sophisticated diagnostic methods and radiological markers are enhancing the understanding of Chiari malformation type 1.
- Investigating comorbidities and underlying diagnoses is crucial for understanding symptomatology and treatment in Chiari malformation type 1.
Purpose of the Study:
- To determine the prevalence and impact of comorbidities and underlying diagnoses in pediatric patients with Chiari malformation type 1.
- To analyze associations between comorbidities and age of onset, radiographic measurements, syringomyelia, and surgical treatment.
- To identify specific patient subgroups and their unique clinical characteristics.
Main Methods:
- Retrospective review of 612 pediatric patients diagnosed with Chiari malformation type 1 between 2008 and 2018.
- Categorization of patients into four groups based on primary comorbidities: nonsyndromic, central nervous system, skeletal, and multiple congenital anomalies.
- Evaluation of associations with age of onset, radiographic measurements, syringomyelia, and surgical treatment.
Main Results:
- The majority of patients (70%) had nonsyndromic Chiari malformation type 1, presenting with the latest age at diagnosis.
- Syndromic patients showed a 6% rate of known genetic abnormalities, with overgrowth syndromes being most common.
- Patients with multiple congenital anomalies exhibited the earliest onset, most severe tonsillar ectopia, and were more frequently surgical candidates.
Conclusions:
- Underlying diagnoses and comorbidities significantly influence syringomyelia rates and surgical intervention in Chiari malformation type 1.
- While most cases are nonsyndromic, routine clinical assessment of growth, scoliosis, and joint hypermobility is recommended.
- These assessments are vital for determining syringomyelia risk and guiding treatment decisions in Chiari malformation type 1 patients.
Background:
Chiari malformation type 1 affects approximately one in 1,000 people symptomatically, although one in 100 meet radiological criteria, making it a common neurological disorder. The diagnosis of underlying conditions has become more sophisticated, and new radiological markers of disease have been described. We sought to determine the prevalence and impact of additional comorbidities and underlying diagnoses in patients with Chiari malformation type 1 on symptomatology and surgical treatment.
Methods:
A retrospective review of 612 pediatric patients with a Chiari malformation type 1 diagnosis and imaging data evaluated between 2008 and 2018 was performed. Because of extensive clinical heterogeneity, patients were separated into four categories based on their primary comorbidities (nonsyndromic, central nervous system, skeletal, and multiple congenital anomalies) to identify associations with age of onset, radiographic measurements, syringomyelia, and surgical treatment.
Results:
The largest group had nonsyndromic Chiari malformation type 1 (70%) and the latest age at diagnosis of any group. In the syndromic group, 6% were diagnosed with a known genetic abnormality, with overgrowth syndromes being the most common. Patients with multiple congenital anomalies had the earliest Chiari malformation type 1 onset, the most severe tonsillar ectopia and obex position, and were overrepresented among surgical cases. Although there were no statistically significant differences between groups and rates of syrinx, we observed differences in individual diagnoses.
Conclusion:
The underlying diagnoses and presence of comorbidities in patients with Chiari malformation type 1 impacts rates of syringomyelia and surgery. Although most Chiari malformation type 1 cases are nonsyndromic, clinical evaluation of growth parameters, scoliosis, and joint hypermobility should be routine for all patients as they are useful to determine syringomyelia risk and may impact treatment.
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