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Related Concept Videos

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An aortic aneurysm is a localized outpouching or dilation at a weak point in the artery wall. It may involve different parts of the aorta, such as the abdominal aorta, aortic arch, or thoracic aorta.Etiological factorsSeveral disorders are associated with aortic aneurysms.Congenital causes, such as primary connective tissue disorders like Marfan syndrome, impact the integrity and strength of connective tissues, notably affecting the aorta. Marfan syndrome is a genetic disorder that specifically...
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Thoracic, aortic arch and abdominal aneurysms are significant vascular conditions that can present with various clinical manifestations and lead to serious complications. Understanding these manifestations and the appropriate diagnostic studies is essential for effective management and treatment.Thoracic Aortic AneurysmsThoracic aortic aneurysms often remain asymptomatic until they reach a size that impinges on adjacent structures. They typically cause deep, diffuse chest pain that radiates to...
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Aneurysm management involves either conservative medical therapy or surgical intervention, depending on the size and symptoms of the aneurysm. Conservative management is generally reserved for smaller, asymptomatic aneurysms, while larger or symptomatic aneurysms often necessitate surgical repair.Conservative Medical TherapyFor small, asymptomatic aneurysms, particularly abdominal aortic aneurysms (AAA) less than 5.5 centimeters in diameter, conservative medical therapy is recommended. This...
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The coronary arteries, originating from the ascending aorta, bifurcate from two sinuses located within the ascending aorta. Positioned just above the aortic semilunar valve, these sinuses house essential aortic baroreceptors and chemoreceptors, crucial for maintaining cardiac function. The left coronary artery and the right coronary artery branch off from the left posterior and anterior aortic sinuses, respectively.
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Related Experiment Video

Updated: May 3, 2026

Creation of Two Saccular Elastase-Digested Aneurysms with Different Hemodynamics in One Rabbit
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Morphological Differences between Ruptured and Unruptured Basilar Bifurcation Aneurysms.

Sudheer Ambekar1, Venkatesh Madhugiri2, Papireddy Bollam2

  • 1Department of Neurosurgery, LSUHSC-S, Shreveport, Louisiana, USA.

Journal of Neurological Surgery. Part B, Skull Base
|January 18, 2014
PubMed
Summary
This summary is machine-generated.

Aspect ratio greater than 1.9 and type-A configuration are linked to ruptured basilar bifurcation aneurysms. Daughter artery ratio did not differ between ruptured and unruptured aneurysms.

Keywords:
aneurysmaspect ratiodaughter artery ratiolateral angle ratiorupture

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Area of Science:

  • Neurosurgery
  • Radiology
  • Vascular Imaging

Background:

  • Morphological parameters like aspect ratio (AP), daughter artery ratio (DA), and lateral angle ratio (LA) are associated with middle cerebral artery bifurcation aneurysms rupture status.
  • Basilar bifurcation aneurysms are a distinct subset of intracranial aneurysms with unique morphological characteristics.

Purpose of the Study:

  • To investigate the differences in AP, DA, LA, and aneurysm orientation between ruptured and unruptured basilar bifurcation aneurysms.
  • To identify morphological predictors of rupture in basilar bifurcation aneurysms.

Main Methods:

  • Three-dimensional (3D) angiograms of 48 patients with basilar bifurcation aneurysms (31 ruptured, 17 unruptured) were analyzed.
  • Quantitative measurements of AP, DA, and LA were performed.
  • Aneurysm projection was classified as type A (long axis along basilar artery) or type B.

Main Results:

  • A significantly higher AP was observed in ruptured aneurysms (2.63 ± 1.1) compared to unruptured ones (1.7 ± 0.55) (p=0.008).
  • An AP ≥ 1.9 demonstrated 68% sensitivity and 70% specificity for rupture.
  • Type-A configuration was strongly associated with ruptured aneurysms (OR=5.9).
  • Lower LAs were noted in ruptured aneurysms, though the difference was not statistically significant (p=0.56).
  • No significant difference in DA was found between ruptured and unruptured aneurysms.

Conclusions:

  • An AP > 1.9 and a type-A configuration are significant indicators associated with ruptured basilar bifurcation aneurysms.
  • Lower lateral angle ratios may also be associated with rupture.
  • Daughter artery ratio is not a reliable predictor for rupture in basilar bifurcation aneurysms.