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Three cases of primitive trigeminal artery (PTA), one associated with arteriovenous malformation and two with cerebral aneurysm, are described. All three patients presented with intracranial hemorrhage. One patient had multiple vascular anomalies, including bilateral PTAs, an unpaired pericallosal artery with a large aneurysm on its bifurcation, and a lobar hematoma. The clinical significance of PTA in patients with intracranial hemorrhage is discussed.