Two patients with traumatic aneurysm were children below 10 years and the aneurysmal sac located at the peripheral branch o f the anterior cerebral artey. One of the traumatic aneurysm had been found by rupture of aneurysmal sac during medical treatment under the impression of traumatic cerebral hemorrhage. The other had been found during disabiliy evaluation with unruptured status. In the latter case, traumatic aneurysm was suspected by the small sized enhancing lesion below the falx cerebri in Brain CT scan and confirmed by transfemoral carotid angiography. We clipped neck of these traumatic aneurysm successfully. So. we report these two cases of traumatic aneurysms with review of the literatures.