Screening for abdominal aortic aneurysm has been shown to reduce the short-term mortality associated with this condition. A large study has now demonstrated that the benefits are maintained for up to ten years. The Multicentre Aneurysm Screening Study (MASS) randomised 67, 770 men aged 65-74 to either ultrasound screening or no screening. Four centres were involved in the project and screening and surveillance was mostly delivered in a primary care setting.