Unruptured middle cerebral artery aneurysm classification [Neurosurgery Wiki]

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====== Unruptured middle cerebral artery aneurysm classification ======

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see [[Intracranial aneurysm classification]].

see also [[Middle cerebral artery aneurysm classification]].

===== Unruptured middle cerebral artery bifurcation aneurysm classification =====

Kumar et al. subclassified [[unruptured middle cerebral artery aneurysm]] into 5 [[type]]s based on the similarities in their morphological features which influenced the [[technique]]s of [[clipping]] as recorded from their preoperative [[three-dimensional computed tomography angiography]] and [[intraoperative]] view. These types and the distinctive feature of each type are described. The various techniques of clipping are discussed based on these subgroups. The groups outlined make possible the establishment of a common technical approach to clipping within the groups. This classification, based on preoperative 3D CTA and intraoperative morphological features of the aneurysm and parent vessels, helps in the intraoperative choice of technique and type of clip application to tackle these lesions.

I 

Simple weak [[aneurysm wall]], well-circumscribed to the site of maximum [[hemodynamic stress]], no extension to [[M1 segment of the middle cerebral artery]] proximally

II 

Central type weak aneurysmal wall extending on to the M1 proximally

III 

Complicated neck branch at the neck of the aneurysm

IV 

Complex [[M2 segment of the middle cerebral artery]] seen to be arising from the aneurysm rather than M1

V 

[[Middle cerebral artery blister aneurysm]]s
((Kumar MV, Karagiozov KL, Chen L, Imizu S, Yoneda M, Watabe T, Kato Y, Sano H, 
Kanno T. A classification of unruptured middle cerebral artery bifurcation
aneurysms that can help in choice of clipping technique. Minim Invasive
Neurosurg. 2007 Jun;50(3):132-9. PubMed PMID: 17882747.
)).

===== Giant unruptured middle cerebral artery aneurysm =====
[[Giant unruptured middle cerebral artery aneurysm]]