Cerebral Aneurysm - The Types

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