We present the case of a 33-year-old man who sustained head trauma in a motor vehicle accident. He remained unconscious from the time of the accident until his death 10 days later. He was shown to have severe hemorrhage that destroyed the corpus callosum from genu to splenium in association with a pericallosal artery aneurysm (distal anterior cerebral artery aneurysm). In addition, hemorrhages typical of traumatic hemorrhages were found elsewhere in the brain. Clinically, he was considered to have suffered the rupture of a berry pericallosal artery aneurysm, which caused the motor vehicle accident. Review of the angiograms in relation to the forensic neuropathologic examination revealed features indicating that the aneurysm had a traumatic origin. We also discuss traumatic pericallosal artery aneurysms in the wider context of traumatic cerebral artery aneurysms. Features that aid in distinguishing traumatic from spontaneous berry aneurysm are considered. Only 17 cases of traumatic cerebral artery aneurysms have been reported in this site. To the best of our knowledge, this is the first such case to be reported in the forensic setting.