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1. Calcium oxalate
Most common
2. Calcium phosphate
Associated with RTA
3. Struvite (MgNH₄PO₄)
Infection stones
4. Calcium carbonate
Rare
5. Cystine
Hexagonal crystals "staghorn"
All are radiopaque
1. Uric acid
Low urine pH
2. Xanthine
Rare
3. Indinavir
Drug related
All are radiolucent
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Ureterovesical junction (UVJ) is the NARROWEST part of the ureter, so stones most commonly get stuck here and cause obstruction.
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