12). CT is often the preferred modality for post-TEVAR surveillance, which can be helpful in the detection of endoleaks, stent migration, stent-graft fracture or collapse, and aneurysmal dilation of other aortic segments. MR imaging-based follow-up can be limited by metallic artifacts. Although...
Abdominal aortic aneurysm is a chronic dilation of the aorta with a natural history toward enlargement and rupture. Its pathogenesis is believed to be multifactorial and complex. Clinical presentation may be asymptomatic, symptomatic, or as rupture. Elective surgery by open transperitoneal or retroperito...
Aneurysms of the sinus of Valsalva (SOV) may be congenital or due to infection, connective tissue disease, or prior surgeries. A congenital sinus of Valsalva aneurysm appears as a thin, focal dilation of the aorta that prolapses into adjacent structures, often described as a “wind sock.” ...
The abdominal aortic aneurysm is characterized by abnormal focal dilation of the abdominal aorta that may be detected incidentally or at the time of rupture. Vigilant monitoring or treatment is required depending on the size of the aneurysm and symptomatic presentation. Risk factors for abdominal ...
a focal dilation of the aorta, can be formed in the thoracic (TAA) or the abdominal (AAA) region; however, our understanding as to what determines the site of aneurysm formation remains quite limited. The extracellular matrix (ECM) is the noncellular component of the aortic wall, that in ...
a focal dilation of the aorta, can be formed in the thoracic (TAA) or the abdominal (AAA) region; however, our understanding as to what determines the site of aneurysm formation remains quite limited. The extracellular matrix (ECM) is the noncellular component of the aortic wall, that in ...
By definition, an AAA is present if there is a dilation of the abdominal aorta to a size 50% greater than the proximal normal segment or to a maximum aortic diameter greater than 3 cm. The overall prevalence of AAA ranges between 4 and 8% in men and is about 1% in women [6]. Risk...
If initial screening results in detection of an AAA, defined by dilation of the aorta by more than 1.5 times its normal size at the level of the renal arteries (e.g., typically > 3 cm in diameter), serial monitoring is performed to detect aggressive growth (> 1 cm/year) or ...
Permanent dilation of theabdominal aortaat least 50% greater than the expected normal diameter. arteriomegaly Diffuse arterial enlargement more than 50% above normal. Type of aneurysm that dissects; although aneurysms rarely dissect, a dissection may lead to aneurysmal changes over time. ...
7 Aortic dissection is defined as separation of the layers within the aortic wall, while aortic aneurysm is defined as a localized or diffuse dilation of the aorta.8,9 Both aortic aneurysm and dissection are caused by weakness of the aortic wall due to congenital defect, hypertension, or ...