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Retired NBME 27 Answers

nbme27/Block 2/Question#19 (reveal difficulty score)
A 45-year-old woman is brought to the ...
Struvite ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—shak360(19)
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Ureas-positive organisms: Pee CHUNKSS

Proteus, Cryptococcus, H pylori, Ureaplasma, Nocardia, Klebsiella, S epidermidis, S saprophyticus

Urease hydrolyzes urea to release ammonia and CO2 which increases pH. Proteus, in particular, is predisposed to the creation of struvite (ammonium magnesium phosphate) stones.

Proteus mirabilis is uniquely motile and causes "swarming" on agar. On both X-ray and CT, struvite ammonium magnesium phosphate stones are radiopaque and look like a coffin-lid as crystals. They also commonly cause staghorn calculi.

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shak360  See (https://nbmeanswers.com/exam/nbme27/3173)[question 23] in the same block +



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