PMC3785370_01
Lateral view from right carotid artery angiography, showing an AcomA aneurysm and a low bifurcation of the right internal carotid artery (ICA), an anomalous A1 tract arising the origin of the ophthalmic artery (Oph).
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Angiography (Figs. 1a and 1b) documented an anterior communicating artery aneurysm; the angiogram also demonstrated a low bifurcation of the right internal carotid artery (ICA), filling of the distal part (A2) of both anterior cerebral arteries from an anomalous A1 tract arising the origin of the ophthalmic artery (Oph A). The right carotid injection revealed the existence of an abnormal vessel branching from the intradural origin of the carotid siphon (Figs. 1a and 1b).
Anteroposterior view from right carotid artery angiography, showing an AcomA aneurysm. Arrowheads, anomalous A1 tract and AcomA aneurysm.
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The anomalous infraoptic proximal tract of the anterior cerebral artery was documented by magnetic resonance angiography (Fig. 2) and three-dimensional CT angiogaphy after surgery.