Abstract
Purpose
Cough-associated headache (CAH) is the most distinctive symptom of patients with Chiari I malformation (CMI) and indicates clinically significant disease. We determined the clinical utility of simple 2D anatomic measurements performed on a PACS workstation by assessing their diagnostic accuracy in predicting CAH in CMI patients.
Methods
Seventy-two consecutive CMI patients (cerebellar tonsillar herniation > 5 mm) with headache seen by neurosurgeons over 6 years were included. Sagittal T1 images were used by two readers to measure: extent of tonsillar herniation, lengths of the clivus and supra-occiput, McRae and pB-C2 lines, as well as clivus-canal, odontoid retroversion, and skull base angles. Neurosurgery notes were reviewed to determine presence of CAH. Mann-Whitney test was used to compare measurements between patients with and without CAH. Predictive accuracy was assessed by receiver operating characteristic (ROC) curve.
Results
47/72 (65.3%) CMI patients reported CAH. Tonsillar herniation with CAH (10.2 mm, 7–14 mm; median, interquartile range) was significantly greater than those without CAH (7.9 mm, 6.3–10.9 mm; p = 0.02). Tonsillar herniation ≥ 10 mm showed sensitivity and specificity of 51% and 68%, and tonsillar herniation > 14 mm showed sensitivity and specificity of 30% and 100%, respectively, for predicting CAH. Other 2D measurements showed no statistically significant differences.
Conclusions
Among the 2D measurements used, only the extent of tonsillar herniation is different between CMI patients with and without CAH. Although CMI is diagnosed with tonsillar herniation of only 5 mm, we found that a much higher extent of herniation is needed to be predictive of CAH.
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Huang, C.W.C., Chang, YM., Brook, A. et al. Clinical utility of 2-D anatomic measurements in predicting cough-associated headache in Chiari I malformation. Neuroradiology 62, 593–599 (2020). https://doi.org/10.1007/s00234-019-02356-0
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DOI: https://doi.org/10.1007/s00234-019-02356-0