Rupture may be indicated by the presence of free fluid in the abdomen. A contrast-enhanced abdominal CT scan is the best test to diagnose an AAA and guide treatment options.Only 10–25% of patients survive rupture due to large pre-and postoperative mortality. Annual mortality from ruptured aneurysms in the United States is about 15,000. Most are due to abdominal aneurysms, with thoracic and thoracoabdominal aneurysms making up 1% to 4% of the total. Aortic rupture
An aortic aneurysm can rupture from wall weakness. Aortic rupture is a surgical emergency and has a high mortality even with prompt treatment. Weekend admission for a ruptured aortic aneurysm is associated with increased mortality compared with admission on a weekday, and this is likely due to several factors including a delay in prompt surgical intervention. Risk factors
Coronary artery disease
Hypertension
Loeys-Dietz Syndrome
Hypercholesterolemia
Hyperhomocysteinemia
Elevated C-reactive protein
Tobacco use
Alcohol use
Peripheral vascular disease
Marfan syndrome
Ehlers-Danlos type IVO
Bicuspid Aortic Valve
Syphilis
IgG4-related disease
Pregnancy
Chronic obstructive sleep apnea
Psoriasis

Pathophysiology
An aortic aneurysm can occur as a result of trauma, infection, or, most commonly, from an intrinsic abnormality in the elastin and collagen components of the aortic wall. While definite genetic abnormalities were identified in true genetic syndromes (Marfan, Elher-Danlos and others) associated with aortic aneurysms, both thoracic and abdominal aortic aneurysms demonstrate a strong genetic component in their aetiology. Prevention
The risk of aneurysm enlargement may be diminished with attention to the patients blood pressure, smoking and cholesterol levels. There have been proposals to introduce ultrasound scans as a screening tool for those most at risk: men over the age of 65.
Convex or convexity may refer to:

Science and technology
Convex lens, in optics

Mathematics
Convex set, containing the whole line segment that joins points
Convex polygon, a polygon which encloses a convex set of points
Convex polytope, a polytope with a convex set of points
Convex metric space, a generalization of the convexity notion in abstract metric spaces
Convex function, when the line segment between any two points on the graph of the function lies above or on the graph
Convex conjugate, of a function
Convexity (algebraic geometry), a restrictive technical condition for algebraic varieties originally introduced to analyze Kontsevich moduli spaces

Economics and finance
Convexity (finance), second derivatives in financial modeling generally
Convexity in economics
Bond convexity, a measure of the sensitivity of the duration of a bond to changes in interest rates
Convex preferences, an individuals ordering of various outcomes

Other uses
Convex Computer, a former company that produced supercomputers

See also
List of convexity topics
Non-convexity (economics), violations of the convexity assumptions of elementary economics
Obtuse angle
All pages with titles beginning with Convex