USMLE Forum Archives - USMLE Step 1 - Pathology question #14
Pathology question #14
revision - 01-08-09 07:55
A 38 year-old female presents to her family physician with a complaint of blurry vision. Vitals were taken: HR 76, BP 110/64, RR 10, Temp. 98.6. Patient fails neuro exam. When asked to look right, the patient's right eye looks right while the patient's left eye cannot adduct. All other ocular movements are intact and neurologic tests were negative. A CT scan was performed and confirmed the physician's suspicion of multiple sclerosis. Where is the likely site of the lesion?
A. Left CN VI nucleus
B. Left medial longitudinal fasciculus (MLF)
C. Right CN III nucleus
D. Right CN VI nucleus
E. Right medial longitudinal fasciculus (MLF)
revision - 01-08-09 07:55
A 38 year-old female presents to her family physician with a complaint of blurry vision. Vitals were taken: HR 76, BP 110/64, RR 10, Temp. 98.6. Patient fails neuro exam. When asked to look right, the patient's right eye looks right while the patient's left eye cannot adduct. All other ocular movements are intact and neurologic tests were negative. A CT scan was performed and confirmed the physician's suspicion of multiple sclerosis. Where is the likely site of the lesion?
A. Left CN VI nucleus
B. Left medial longitudinal fasciculus (MLF)
C. Right CN III nucleus
D. Right CN VI nucleus
E. Right medial longitudinal fasciculus (MLF)
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#4
Re: Pathology question #14 mcdocmd - 03-06-09 07:41 i am agree that the lesion is in the Medial Longitudinal Fasciculus. but my question is why LEFT??
I know that the fasciculus goes from the VI to the opposite III nucleus. my question is why the lesion can not be in the right side.
#5
Re: Pathology question #14 usmlefever3 - 03-06-09 11:53 it should be right medial longitudinal fasciculus
because MLF job is to transfer the afferent signal from same side abducent nucleus to other side efferent signal to oculomotor nucleus
so,MLF leison in same side of abducent nucleus
#6
Re: Pathology question #14 usmlefever3 - 03-07-09 09:30 srry..answer should be left MLF as abducent nucleus send signal to contralateral MLF and medial rectus subnucleus of occulomotor nerve
#7
Re: Pathology question #14 galaxy - 06-04-10 20:06 A 38 year-old female presents to her family physician with a complaint of blurry vision. Vitals were taken: HR 76, BP 110/64, RR 10, Temp. 98.6. Patient fails neuro exam. When asked to look right, the patient's right eye looks right while the patient's left eye cannot adduct. All other ocular movements are intact and neurologic tests were negative. A CT scan was performed and confirmed the physician's suspicion of multiple sclerosis. Where is the likely site of the lesion?
E. Right medial longitudinal fasciculus (MLF)
#8
Re: Pathology question #14 babbu5508 - 06-21-10 01:58 b. left medial longitudinal fasciculus (MLF) ...internuclear ophthalmoplegia seen in multiple sclerosis..lesions cause damage to the ipsilateral eye
#9
Re: Pathology question #14 bingousmle - 06-30-10 22:58 left MLF as abducent nucleus send signal to contralateral MLF and medial rectus subnucleus of occulomotor nerve....
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