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American Journal of Roentgenology, Vol 105, 361-364, Copyright © 1969 by American Roentgen Ray Society

ROENTGENOGRAPHIC EXAMINATION OF FORAMEN TRANSVERSARIUM OF AXIS

PRACTICAL CONSIDERATIONS

TRYGVE O. GABRIELSEN 1

1 From the Department of Radiology, The University of Michigan Medical Center, Ann Arbor, Michigan

One can always predict that a small vertebral artery will be found at angiography whenever the foramen transversarium of the axis on the same side is small. The minimum diameter of the cephalic part of this canal is most often 1.5 mm. or 2.0 mm. greater than the internal diameter of the vertebral artery. Greater discrepancy in size may exist, especially in the presence of occlusive disease involving the vertebral artery.

The foramen transversarium of the axis can usually be seen in oblique projections of the cervical spine or on lateral roentgenograms of the skull obtained with the patient lying prone and the side of the face against the cassette. The pertinent anatomy is discussed.


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Copyright © 1969 by the American Roentgen Ray Society.