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NBME 24 Answers

nbme24/Block 2/Question#27

A 47-year-old man comes to the physician because of ...

Monosodium urate

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submitted by neonem(227),

These are gout crystals. I suppose the best way to differentiate this case from pseudogout is that the crystals are sharp & needle-shaped and not rhomboid-shaped.

sympathetikey  Yep. They tried to throw you off with the picture, but the wording in the stem says its a "photomicrograph" -- not exposed to plane polarized light, where you would see the negative birefringence. +5