Normal range of clivoaxial angle in adults using flexion and extension cervical magnetic resonance imaging scans
In: The neuroradiology journal, Jg. 34 (2021-03-09), Heft 4
Online
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Zugriff:
Objective An abnormally decreased clivoaxial angle (CXA) is used during the clinical evaluation for corrective skull base surgery. Published normal ranges of CXA using x-ray, computed tomography, or magnetic resonance imaging (MRI) vary dramatically, especially with neck flexion or extension. The aim of this study was to use high-resolution MRI to determine the normal range of CXA in various neck positions using a reproducible measurement technique. Methods The CXA was measured in 10 healthy volunteers on sagittal T2 SPACE c-spine MRI in supine and prone positions and with the neck both neck and extended. CXA is strictly defined as the angle between a line along the inferior third of the dorsal clival cortex and a line from the superior/posterior cortex of the dens to the posterior/inferior corner of the C2 body. Statistical analysis was performed in all positions and included mean CXA, range, standard deviation ( SD), inter-reader agreement, and group comparisons. Results The mean CXA overall was 156.92° ( SD=4.23°; range 134–179°). The mean value for extension CXA was 169.20° ( SD=5.81°), and the mean value for flexion CXA was 144.73° ( SD=5.71°), the difference being statistically significant ( pConclusions We report normal ranges for CXA in various neck positions based on 3D T2-weighted MRI, using a reproducible measurement method. There was a significant difference in the CXA values between neck extended and neck flexed positions but not between supine and prone positions.
Titel: |
Normal range of clivoaxial angle in adults using flexion and extension cervical magnetic resonance imaging scans
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Autor/in / Beteiligte Person: | Sayah, Anousheh ; Sandhu, Faheem A. ; Berkowitz, Frank ; Eric C Munoz ; April D Farley |
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Zeitschrift: | The neuroradiology journal, Jg. 34 (2021-03-09), Heft 4 |
Veröffentlichung: | 2021 |
Medientyp: | unknown |
ISSN: | 2385-1996 (print) |
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