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  #1  
Old 08-21-2011
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Neuro Circle of Willis Diagram Question!

The Circle of Willis is shown. Aneurysm in which vessel may result in loss of peripheral vision in both eyes?
A. 8
B. 2
C. 6
D. 9
E. 1

Circle of Willis Diagram Question!-circle_of_willis_labeled.gif
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  #2  
Old 08-21-2011
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answer is D. 9!
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Old 08-21-2011
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ant comm art.
ans 2
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Old 08-21-2011
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I am guessing ...B.2
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Old 08-21-2011
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yeah it should b D .... posterior cerebral artery ... with macular sparing ... while in other case like diabetes etc macula is damaged and we can get central scotomas
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Old 08-21-2011
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Quote:
Originally Posted by yasirsattar75 View Post
yeah it should b D .... posterior cerebral artery ... with macular sparing ... while in other case like diabetes etc macula is damaged and we can get central scotomas
for peripheral vision in both eyes?
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Old 08-21-2011
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Quote:
Originally Posted by bebix View Post
for peripheral vision in both eyes?
yup if both posterior cerebral arteries are damaged then both eyes are involved and question states to just locate the artery so i think it should b D as there is no option for basilar artery ... ... its in f.a there is nice diagram their also ...
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Old 08-21-2011
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I am gonna go with the person who said 2. Makes most sense to me.
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Old 08-21-2011
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Quote:
Originally Posted by yasirsattar75 View Post
yup if both posterior cerebral arteries are damaged then both eyes are involved and question states to just locate the artery so i think it should b D as there is no option for basilar artery ... ... its in f.a there is nice diagram their also ...
yup, but we are talking about just "bitemporal hemianopsia"

among the causes, we have
a Giant anterior communicating artery aneurysm (more common)

Last edited by bebix; 08-21-2011 at 09:47 AM.
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Old 08-21-2011
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Quote:
Originally Posted by bebix View Post
yup, but we are talking about just "bitemporal hemianopsia"

among the causes, we have
a Giant anterior communicating artery aneurysm (more common)
yeah just seen question again its bilateral so its gonna b 2 ... bitemporal hemianopsia... but peripheral vision made me think about posterior cerebral artery involvement but as we know it can b berry aneuryms so chances of option 2 are more ..u are right bebix ..
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Old 08-21-2011
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B)2. ant communicating art
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Old 08-22-2011
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anterior communi.
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Old 08-22-2011
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plz post the answer...
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The correct answer is B.
Loss of peripheral vision in both eyes is called bitemporal hemianopsia and can occur in the case of an aneurysm in the anterior communicating artery (2). An aneurysm in the posterior communicating artery (8) may result in CN III palsy.

Occlusions in the middle cerebral artery (6) may result in paralysis/sensory loss in the contralateral face and arm, Broca’s and Wernicke’s aphasia, and contralateral neglect syndrome. An occlusion of the anterior cerebral artery (1) may result in paralysis/sensory loss of contralateral foot and leg, gait apraxia, and urinary incontinence. Posterior cerebral artery (9) occlusion will result in contralateral hemianopsia with macular sparing.
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Old 08-22-2011
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why r u calling loss of peripheral vision , bitemporal hemianopia? it should be tunnel vision, ???
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Old 08-22-2011
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Quote:
Originally Posted by dr_lizard View Post
why r u calling loss of peripheral vision , bitemporal hemianopia? it should be tunnel vision, ???
bitemporal hemianopia is the same as tunnel vision

http://www.med.yale.edu/caim/cnerves...ics/cn2_9a.gif
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  #17  
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i see. so what we call when we have bilateral anopia with macular sparing?
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Quote:
Originally Posted by dr_lizard View Post
i see. so what we call when we have bilateral anopia with macular sparing?
so, that is Homonymous Hemianopia with macular sparing.
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