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Old 12-20-2009
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Kidney What is the main component of a Staghorn Calculus?

I faced a question on this on USMLE Rx. Their answer is Calcium, which I totally disagree on because I though its an Ammonium Magnesium Phosphate stone?

I tried googling but couldn't really get anything.

What do you guys think?
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Old 12-21-2009
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Cool

I think you are correct. But first, staghorn is a morphological rather than a chemical discription, as cystine stones may also cause staghorn calculi, but much less frequently.

Also struvite stones contain variable amounts of calcium beside ammonium, phosphate and magnesium, so it depends on the choices you have, but generally, saying calcium stones means either calcium phosphate or calcium oxalate
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Old 12-21-2009
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staghorn calculus means a stone that is found in the pelvis and extends to one or more calyces
What is the main component of a Staghorn Calculus?-staghorn.jpg

It can be any type of renal stones but most commonly a struvite stone.
That question in USMLERx if it said that calcium is more common than struvite then it's 100% wrong.
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