Which arterial occlusion led to this visual field defect? - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
Home
USMLE Articles
USMLE News
USMLE Polls
USMLE Books
USMLE Apps
Go Back   USMLE Forums > USMLE Step 1 Forum

USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 03-03-2012
USMLE Forums Scout
 
Steps History: Not yet
Posts: 62
Threads: 29
Thanked 11 Times in 9 Posts
Reputation: 21
Neuro Which arterial occlusion led to this visual field defect?

QID - m200311
a 79yr old, has been bumping into walls, especially on his right side. -filler - visual fields are reduced on the right side in both eyes. occlusion of which of the following blood vessels is most likely responsible.

a) anterior comm. artry
b) internal carotid
c) middle cerebral
d) opthlamic
e) posterior cerb.
f) posterior cerberal
g) vertebral

-- so he has a rt sided homonyous hemianopia -- so thats a problem on his - LF optic tract ?
- ok so -- isnt it supplied by the anterior cerebral artery? but this option isnt avaliable, so im inclined to pick anterior comm. artery
- but kaplan says - its the - posterior comm.
- reading kaplans explantation, they say the patient probably has - macular sparing now that is not said in the question stem, but if he had macular sparing - then kaplans answer makes, sense.

on what basis are they thinking i should assume he has macular sparing,. any ideas ? ty

Last edited by sfsheran; 03-03-2012 at 01:42 PM.
Reply With Quote Quick reply to this message



  #2  
Old 03-03-2012
LatinGeorge's Avatar
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 653
Threads: 47
Thanked 409 Times in 249 Posts
Reputation: 419
Default

I would go with A.

Seems to me that the affected is the Left optic tract.
Reply With Quote Quick reply to this message
  #3  
Old 03-03-2012
USMLE Forums Scout
 
Steps History: Not yet
Posts: 62
Threads: 29
Thanked 11 Times in 9 Posts
Reputation: 21
Default

- Posterior cerebral -- is the answer kaplan gives
Reply With Quote Quick reply to this message
  #4  
Old 03-03-2012
LatinGeorge's Avatar
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 653
Threads: 47
Thanked 409 Times in 249 Posts
Reputation: 419
Default

Quote:
Originally Posted by sfsheran View Post
QID - m200311
a 79yr old, has been bumping into walls ,especialy on his right side. -filler - visual frields are reduced on the right side in both eyes. occulsion of which of the following blood vessels is most likly responsible.

a) anterior comm. artry
b) internal carotid
c) middle cerebral
d) opthlamic
e) posterior cerb.
f) posterior cerberal
g) vertebral

-- so he has a rt sided homonyous hemianopia -- so thats a problem on his - LF optic tract ?
- ok so -- isnt it supplied by the anterior cerebral artery? but this option isnt avaliable, so im inclined to pick anterior comm. artery
- but kaplan says - its the - posterior comm.
- reading kaplans explantation, they say the patient probably has - macular sparing now that is not said in the question stem, but if he had macular sparing - then kaplans answer makes, sense.

on what basis are they thinking i should assume he has macular sparing,. any ideas ? ty

now when they say macular sparring , that's another ball park... i think its a poorly written question.
Reply With Quote Quick reply to this message



Reply

Tags
Neuroanatomy-, Step-1-Questions

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Location
Where you live. Leave blank if you don't want to tell.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Visual reflexes concept lemontea88 USMLE Step 1 Forum 5 12-06-2012 02:35 PM
University vs field of choice amberafzal USCE & Clinical Rotations 2 04-14-2012 01:39 AM
which visual field defect is this? struggle USMLE Step 1 Forum 10 11-27-2011 05:12 PM
Controlled DM II with visual difficulties Seetal USMLE Step 2 CK Forum 15 10-08-2011 09:55 AM
15 yrs away from Medical Field DariAwar General Topics Forum 3 05-12-2011 03:12 AM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)