... may help physicians better understand the chronological development of a brain aneurysm. ... For patients with CAs, who are more likely to undergo an aneurysm rupture due to risk factors such as smoking or hypertension, ... Using radiocarbon dating to date samples of ruptured and unruptured cerebral aneurysm (CA) tissue, the team, led by ... The rate of death when they rupture is more than 35 percent. The high rate of death has led the medical community to try to ...