Section Editor: Sandy Cheng-Yu Chen, M.D.
Taipei Medical University Hospital, Taipei, Taiwan
Figure Caption
Azygous anterior cerebral artery (ACA) is the persistence of the embryonic median artery of the corpus callosum, a very rare vascular anomaly in which the two anterior cerebral arteries join to form a single trunk. An azygous artery may be associated with a number of brain anomalies such as dysgenesis of corpus callosum and holoprosencephaly, and a predisposition to aneurysm formation. An occlusion of an azygous artery (arrow in A) may result in infarcts of the bilateral medial frontal lobes and corpus callosum (arrow in B).