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Cronin, CG,Lohan, DG,Mhuircheartigh, JN,Meehan, CP,Murphy, J,Roche, C
2009
January
Clin Radiol
CT evaluation of Chamberlain's, McGregor's, and McRae's skull-base lines
Published
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Optional Fields
BASILAR IMPRESSION OSTEOGENESIS IMPERFECTA INVAGINATION COMPLICATIONS MRI
64
64
69
AIM: To evaluate the mean distance from the odontoid process of C2 to the standard skull-base tines (Chamberlain's, McGregor's, and McRae's lines) on computed tomography (CT) imaging. To compare these measurements to previously documented plain radiograph and magnetic resonance imaging (MRI) measurements.MATERIALS AND METHODS: Reformatted midline sagittal CT images of 150 adults were retrospectively evaluated. The shortest perpendicular distance was measured from the Chamberlain's, McGregor's and McRae's baselines for each subject to the odontoid tip. Statistical analysis was performed to compare the CT data with the previously obtained MRI and plain film data.RESULTS: The mean position of the odontoid process was 1.4 mm below Chamberlain's line (median 1.2 mm, SD 2.4 mm), 0.8 mm (median 0.9 mm, SD 3 mm) below McGregor's line and 5 mm (median 5 mm, SD 1.8 mm) below McRae's tine. There is no significant difference between mate and female results (p > 0.05) or between these CT and previous MRI measurements (p > 0.05).CONCLUSION: These results provide the mean and range of normal distance from the odontoid process to the most frequently used skull-base tines on the current population on CT. (C) 2008 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.
DOI 10.1016/j.crad.2008.03.012
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