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American Journal of Roentgenology, Vol 107, 515-519, Copyright © 1969 by American Roentgen Ray Society

THE SO-CALLED CONDYLOID FORAMEN IN THE HALF AXIAL VIEW

J. C. GATHIER M.D.1 and G. W. BRUYN M.D.1

1 From the Neurological Department (Head: J. C. Gathier, M.D.) of the Central Military Hospital, Utrecht, the Netherlands

In the half axial view of the skull, 2 different radiolucent areas just lateral to the margin of the foramen magnum may occasionally be visible.

The first one is projected "under" the upper outline of the petrous bone and is caused by a particular anatomic feature of the sigmoid groove, consisting of a local deepening which is described as fossa sigmoidea.

The second one is more frequently noted; often shows a crescent shape and is located somewhat more mediodorsally: it consists of the condyloid canal. Its roentgenographic shape and size in this view are determined by a more medial and horizontal direction of the longitudinal axis of the canal, due to a far-medially reaching course of the sigmoid sinus, undercutting the osseous mass of the margin of the foramen magnum.


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Copyright © 1969 by the American Roentgen Ray Society.