Cerebral aneurysm is defined as a cerebrovascular disorder
causes of the blood vessel to bulge or balloon out of
the wall of a blood vessel as a result of the weaken
of blood vessels and veins and occurred mostly at the bifurcations and
branches of the large arteries located at the Circle of Willis.
II. Types of Cerebral aneurysm
A. Cerebral aneurysm classification based on angioarchitecture
Dr. Pritz MB. at the Indiana University School of Medicine,
suggested that Only aneurysms in which preoperative imaging studies and
operative findings were sufficient for classification
were included. All 329 reviewed aneurysms could be divided into 2
groups: fusiform (n=16) and saccular (n=313). Fusiform aneurysms could
be subdivided into 2 types: simple (no branch vessel; n=10) and complex
(one or more side branches; n=6). Saccular aneurysms could be subdivided
into 3 groups: those not associated with a branch vessel (n=31), those
associated with a side-branch vessel (n=125), and those located at a
bifurcation (n=157). Each of these categories of aneurysms could be
classified further based on its association with a conducting, primary,
secondary, tertiary, or side-branch vessel. Classification of cerebral
aneurysms according to this scheme adequately described all reviewed
aneurysms. Grouping aneurysms according to this approach focuses on
similarities in angioarchitecture and potential rheologic properties
that should prove useful for evaluation of aneurysm growth, rupture, and treatment(1).
B. Cerebral aneurysms classified both by size and shape
Others researchers suggested that Cerebral aneurysms are classified both by size and shape
B.1. In sizes
1. Diameter of less than 15 mm is classified into Small aneurysms
2. Large aneurysms with size from 15 to 25 mm
3. Giant aneurysms with size from 25 to 50 mm
4. Super giant aneurysms for any aneurysms with size over 50 mm.
B.2. In shapes
1. Berry or Saccular aneurysms
Saccular aneurysms are the most common form of cerebral aneurysm and
refers to any aneurysm with a saccular outpouching, including berry
aneurysms. Berry aneurysm, is a saccular aneurysm with a neck or stem
resembling a berry.
2. Dissecting aneurysmsis is defined as a condition of
splitting or dissection of an arterial wall as a result of bleeding into
the weakened wall splits the wall.
3. Fusiform aneurysm is also known as Richet's aneurysma is a localized dilation of an artery in which the entire circumference of
the vessel is distended. The result is an elongated, tubular, or
spindlelike swelling(2).
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Sources
(1) http://www.ncbi.nlm.nih.gov/pubmed/20621522
(2) http://medical-dictionary.thefreedictionary.com/fusiform+aneurysm
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