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The authors report a patient with a small traumatic cirsoid aneurysm of the scalp, diagnosed by duplex doppler ultrasonography. This 15-year-old boy was diagnosed as a cirsoid aneurysm by duplex doppler ultrasonogram which revealed an ovoid cystic lesion at left temporal area of scalp containing vascular flow mapping. The gross appearance showed an aneurysm with arteriovenous fistula, consisting of two feeding arteries and two draining veins. Total removal of mass was made and the histological examination revealed an aneurysm which showing irregular contour of inner surface and thickened fibrotic vascular wall without normal arterial layers. Noninvasive duplex doppler ultrasonography before surgical excision or direct puncture embolization of cirsoid aneurysms of the scalp could be recommended as an alternative management option. Key words:Traumatic cirsoid aneurysm;Noninvasive doppler ultrasonography.