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American Journal of Roentgenology, Vol 98, 602-610, Copyright © 1966 by American Roentgen Ray Society

THE CLINICAL SIGNIFICANCE OF THE AZYGOS ANTERIOR CEREBRAL ARTERY (A.C.A.)

MARJORIE LEMAY M.D.1 and CHARLES A. GOODING M.D.1

1 From the Departments of Radiology, Harvard Medical School, Peter Bent Brigham Hospital and Boston Veterans Administration Hospital

The phylogenetic development of the unpaired (azygos) anterior cerebral artery and its transient existence during human embryologic development are reviewed.

Retrospective examination of arteriograms of 107 patients in whom both internal cerebral arteries were opacified revealed 4 examples of azygos A.C.A.

Azygos A.C.A.s may occur with other congenital anomalies. Cases showing their occurrence with an arteriovenous malformation and an aneurysm of a pericallosal artery are presented.

The clinical implications of the azygos A.C.A. or bihemispheric anomaly, are illustrated by a case history of a patient who had occlusion of a single large anterior cerebral vessel.


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Copyright © 1966 by the American Roentgen Ray Society.