Upward Gaze
Topic: Anatomy
Created on Sunday, February 1 2009 by dr. no
Last modified on Sunday, February 1 2009.
A 72 year old man presents with a month history of progressive difficulty in upward gaze and was found on exam mid-dilated mildly reactive pupils, and convergence-retraction nystagmus. Where is the lesion?
A) Lower Pons B) Non-dominant parietal lobe C) Dominant parietal lobe D) Thalamus E) Midbrain tectal region
This question was created on February 01, 2009 by dr. no.
This question was last modified on February 01, 2009.
ANSWERS AND EXPLANATIONS
A) Lower Pons
This answer is incorrect.
A lesion producing these findings occurs in the midbrain tectal region. It usually occurs by extra-axial compression on the quadrigeminal plate.
These findings are consistent with Parinaud's syndrome (
See References)
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B) Non-dominant parietal lobe
This answer is incorrect.
A lesion producing these findings occurs in the midbrain tectal region. It usually occurs by extra-axial compression on the quadrigeminal plate.
These findings are consistent with Parinaud's syndrome (
See References)
|
| | |
| | |
Please log in if you want to rate questions. |
C) Dominant parietal lobe
This answer is incorrect.
A lesion producing these findings occurs in the midbrain tectal region. It usually occurs by extra-axial compression on the quadrigeminal plate.
These findings are consistent with Parinaud's syndrome (
See References)
|
| | |
| | |
Please log in if you want to rate questions. |
D) Thalamus
This answer is incorrect.
A lesion producing these findings occurs in the midbrain tectal region. It usually occurs by extra-axial compression on the quadrigeminal plate.
These findings are consistent with Parinaud's syndrome (
See References)
|
| | |
| | |
Please log in if you want to rate questions. |
E) Midbrain tectal region
This answer is correct.
A lesion producing these findings occurs in the midbrain tectal region. It usually occurs by extra-axial compression on the quadrigeminal plate.
These findings are consistent with Parinaud's syndrome (
See References)
|
| | |
| | |
Please log in if you want to rate questions. |
References:
1. Leigh, R.J., and Zee, D.S. (2006). The Neurology of Eye Movements, 4th Edition. Oxford University Press, Oxford. (ISBN:0195300904) | Advertising:
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anatomy
Upward Gaze
Question ID: 020109085
Question written by dr. no. (C) FrontalCortex.com 2006-2009, all rights reserved.
Created: 02/01/2009
Modified: 02/01/2009
Estimated Permutations: 120