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Old 02-24-2013
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Default PCA stroke???

MTB 2:
Ipsilateral sensory loss of face
Contralateral sensory loss of limbs
Limb ataxia

MTB3:
Prosopagnosia (inablitiy to recognize faces)
homonymous hemianopsia, with macular sparing (not for PCA but for MCA )

Now i know PCA normally innervate
Occipital lobe- explains hemianopsia
Parts of thalamus- may be VPL&VPM- explains sensory loss of face and limbs
Prosopagnosia- due to cortical distribution of PCA to fusiform gyrus.

Now Am I missing something which could be relevant to exam?
Thanks
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Old 02-24-2013
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what i know is macular sparing is for PCA not MCA occlusion..because macula had dual blood supply which spares from occlusion..
MCA occlusion causes contralateral homonymous hemianopia alone ....
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Old 02-24-2013
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Quote:
Originally Posted by venky2600 View Post
what i know is macular sparing is for PCA not MCA occlusion..because macula had dual blood supply which spares from occlusion..
MCA occlusion causes contralateral homonymous hemianopia alone ....
Thats what i know too but in MTB 3 pg-200 it states its due to MCA. So is it an ERRATA?
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Old 02-25-2013
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Quote:
Originally Posted by koolkiller88 View Post
Thats what i know too but in MTB 3 pg-200 it states its due to MCA. So is it an ERRATA?
but in my mtb 3 pg.200 also states PCA occlusion lead to homonymous hemianopia with macular sparing..(not MCA occlusion).....which version you're using..?
mab be i guess it's wrong in urs then....coz there are many mistakes in mtb-3 i guess...for example in obstetrics 3hr OGTT test values also were given wrong which are most important....anyways thanks for raising this doubt though
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Old 02-25-2013
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I have the 2nd edition
in page 200 , it states that it is due to MCA
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Quote:
Originally Posted by dralan View Post
I have the 2nd edition
in page 200 , it states that it is due to MCA
ohh k...mine is old edition with PCA in same page 200...but wonder why they changed in it....thanks for your info..
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Old 02-25-2013
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Posterior Cerebral Artery Stroke


Quote:
Visual field loss

Unilateral infarction produces homonymous hemianopia. Sparing of the macula is encountered frequently in infarction of the occipital lobes due to PCA occlusion. Macular sparing may be caused by collateral vascular supply to the macular region or by the very large macular representation in the occipital cortex; additionally, bilateral representation of macular vision has been suspected.
http://www.dartmouth.edu/~dons/figur..._3/Fig_3-3.htm

Quote:
macular sparing occurs when calcarine infarction is caused by posterior cerebral artery occlusion if the middle cerebral artery supplies the posterior calcarine cortex
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Old 02-13-2015
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MTB 2 pg 274:
PCA STROKE
Ipsilateral sensory loss of face, ninth and 10th cranial nerves (???)
Contralateral sensory loss of limbs
Limb ataxia

Could someone explain this?? this doesnt make sense...
I guess MTB2 is wrong in this portion??
am I missing something??

please someone help
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