Multiple inflammatory factors, playing a crucial role in cerebral aneurysm formation, have been identified. Tumor necrosis factor-alpha (TNF-α) has been revealed to have a close connection with several risk factors that affect aneurysm formation. Remarkable expression in aneurysm walls of mRNA for TNF-α has been observed in humans. Possible therapeutic interventions to reduce the formation of cerebral aneurysms may include the inhibition of mediators of inflammation