Aneurysm of azygous anterior cerebral artery

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Abstract
A patient with a fusiform aneurysm of an azygous anterior cerebral artery (ACA) associated with a ruptured saccular aneurysm at its distal end is described. Gross, microscopic, and radiological documentation of this anomaly is presented. In cases where the question of an unpaired ACA arises, a projection paralleling the radiological baseline should be employed during angiographic studies thus affording better visualization of these vessels. Clinically, in patients with pericallosal aneurysms, their frequent association with azygous ACA''s should be borne in mind, since injury to this common arterial trunk affects both hemispheres and the corpus callosum with tragic results.