anne
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You are working in a busy urology clinic and see a patient who was just sent up from the ER. He is complaining of pain in his back from which he cannot find relief. He was diagnosed with a stone before by finding it in his urine. An abdominal X ray without contrast shows no evidence of a stone, but he does have blood in his urine. His stone is likely made of which of the following?
A. Ammonium, magnesium, and phosphate
B. Calcium
C. Cystine
D. Phosphate
E. Uric acid
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| usmleasr
Forum Guru
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E.uric acid
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| anne
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correct!!!again i have a question,how'd we differentiate if its cysteine or uricacid stones bec both are radiolucent.
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| usmleasr
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i think cysteine stone r radio opaque :roll:
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| asmi
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Yes cysteine stones are radiopaque :oops:
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| merjr
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Cysteine stones are visible on X-ray though not as radioopaque as Calcium stones.
But urine analysis will confirm it
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| asmi
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and the test to detect cysteine stones is nitroprusside cyanide test .
:idea: ex: 10 yrs child with severe colicky flank pain.urineanalysis shows yellowbrown hexagonal crystals.Abd X-ray showing radiopaque staghorn calculi in renal pelvis :arrow: diagnosis cystinuria
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| anne
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thanx asma---i didnt know tsaghorn stones could be bec of cysteine too.i thought just Mg-NH4-PO4 stones are staghorn type.thanx alot!!
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