Posts: 3,675,937
Threads: 734,344
Joined:
Sep 2021
Reputation:
5
A 35 year old man comes to the physician because his wife noticed that his right pupil was small. Physicall examination shows that the right pupil is constricted and does not react to light. His left pupil is normal. These findings are most likely due to a lesion of which of the following structures on the right?
A) Cervical spinal cord
B) Frontal eye fields
C) Laterla geniculate nucleus
D) Optic tract
E) Visual cortex.
Posts: 3,675,937
Threads: 734,344
Joined:
Sep 2021
Reputation:
5
Well, since nobody wants to answer, the given answer is D but i was wondering if it could be A???
Posts: 3,675,937
Threads: 734,344
Joined:
Sep 2021
Reputation:
5
Any more opinions ? This is important because most people just swallow the offline NBME answers and some of them are very wrong.
Posts: 3,675,937
Threads: 734,344
Joined:
Sep 2021
Reputation:
5
It is mostly T1 where the preganglionic sympathetic can be affected to result in Horners as in thoracic outlet syndrome. here that choice is not there
So i think A too
optic tract lesions would cause contralat hemianopia
Posts: 3,675,937
Threads: 734,344
Joined:
Sep 2021
Reputation:
5
Thanks all for the response. I agree with all of you. Will go with A.
Posts: 3,675,937
Threads: 734,344
Joined:
Sep 2021
Reputation:
5
upward i don't remember seeing this question in NBME 3 as you stated.
