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NBME 21 Answers

nbme21/Block 2/Question#44 (23.6 difficulty score)
A 75-year-old man has the sudden onset of ...
Parietal lobe, left🔍
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 +3 
submitted by h0odtime(42),
  • R Lower quadrantanopia = C/L Parietal Lesion/MCA via Dorsal optic radiation.

  • If top quarter was gone, then it would be C/L temporal lesion via meyer loop.

drzed  the dorsal optic radiation is also known as "baum's loop" +  
icedcoffeeislyfe  FA2020 pg 542 +  



 +2 
submitted by hayayah(990),
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lroew tnraoaiuqnaadp: eraiptal elsnio

vs eppru anquaptdaaonri = tpoalerm eiolsn

mcl  also, to differentiate whether it is the left or right parietal lobe, recall that stimuli from the left visual field hits the nasal side of the left retina and the temporal side of the right retina, then goes to the right side of the brain. [This figure](https://operativeneurosurgery.com/lib/exe/fetch.php?w=600&tok=856a37&media=optictract.jpg) is helpful. +4  
d_holles  So you're saying that there's two crosses, making it ipsilateral? @mci +  



 +2 
submitted by meryen13(10),

heres how I remember this: Temporal lesions are on Top, so parietal lesions are below. and always remember the visual field and the side of lesion are the opposite sides.




 +0 
submitted by kevin(3),

Double Flip — If R. Lower quadrantanopia --> L. Upper (Parietal) lesion.

Just remember Double Flip