Accepted
at 2:06 p.m. Jan, 11, 2026
by
Ahmed7
Author:
arjunagrawal01
Rationale for change
#AK_Step2_v12::#UWorld::Step::4408
Uworld question assesses CN3 palsy, able to cut down to two answer choises, mass compressing CN3 or diabetic ischemia of CN3.
This patient had a non dilated pupil, which was essential in differentiating between these two main answer choices in this question. (At least for me)
No changes in fields
Text
"Rule of the pupil" in CN III palsy (eye down & out):
- Dilated pupil = {{c1::PCOM aneurysm::PCOM aneurysm or ischemia}}
- Non-dilated pupil = {{c1::ischemia (common in diabetes)::PCOM aneurysm or ischemia}}
Extra
Motor in the Middle, PNS in the Periphery
Common causes of CN III damage are:
- Ischemia
- PCom aneurysm
- Uncal herniation
- Cavernous sinus thrombosis
- Midbrain stroke
Common causes of CN III damage are:
- Ischemia
- PCom aneurysm
- Uncal herniation
- Cavernous sinus thrombosis
- Midbrain stroke
Lecture Notes
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Missed Questions
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Pathoma
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Boards and Beyond
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First Aid


Sketchy
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Sketchy 2
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Sketchy Extra
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Picmonic
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Pixorize
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Physeo
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Bootcamp
Watch associated Bootcamp video - Aneurysms and Intracranial Hemorrhage: Types of Aneurysms and Location
Watch associated Bootcamp video - Cranial Nerves 1-6: Cranial Nerve III
Watch associated Bootcamp video - Cranial Nerves 1-6: Cranial Nerve III
OME
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Additional Resources
One by one
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