Cerebellar tonsil ectopia measurement in type I Chiari malformation patients show poor inter-operator reliability
Braden J Lawrence1,2, Aintzane Urbizu3, Philip A Allen4
1Department of Biological Engineering, University of Idaho, 875 Perimeter Drive MS 0904, Moscow, ID, 83844-0904, USA.
Fluids and Barriers of the CNS
|December 18, 2018
Summary
Radiologists showed significant variability in measuring cerebellar tonsillar position (TP) for Chiari malformation (CM-I) Type 1, highlighting the need for improved diagnostic consistency in CM-I assessment. Further research into objective parameters is recommended for better patient selection.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Type 1 Chiari malformation (CM-I) diagnosis relies on cerebellar tonsillar position (TP) below the foramen magnum (FM).
- Radiographic findings in CM-I can be highly variable, impacting clinical course and patient outcomes.
- Inter-operator reliability of MRI-based TP measurements in CM-I is not well-established.
Purpose of the Study:
- To evaluate the inter-operator reliability of MRI-based cerebellar tonsillar position (TP) measurements in Type 1 Chiari malformation (CM-I).
- To assess measurement variability among expert operators for diagnosing CM-I.
Main Methods:
- Thirty-three T2-weighted MRI datasets (23 CM-I patients, 10 controls) were analyzed.
- Seven expert operators measured TP inferior to the foramen magnum (FM) using McRae's line on mid-sagittal MRI views.
- Intraclass correlation coefficient (ICC) quantified overall operator agreement.
Main Results:
- Mean TP measurements were 6.38 ± 2.19 mm for asymptomatic CM-I, 9.57 ± 2.63 mm for symptomatic CM-I, and 0.48 ± 2.88 mm for controls.
- A significant average range of 7.7 mm was observed across all TP measurements.
- Overall operator agreement was relatively high, with an ICC of 0.83.
Conclusions:
- A substantial range in TP measurements among expert operators indicates potential diagnostic variability for CM-I.
- Independent measurements by two radiologists are recommended for CM-I diagnosis and surgical planning.
- Development of objective diagnostic parameters using automated algorithms could reduce inter-operator variation and improve patient selection for CM-I.
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