Not true about 'Struvite Stones' is :: (A) better k/a staghorn calculus, (B) these are triple phosphate stones, (C) common in infected urine, (D) usually seen in acidic urine
Answer is D. Ans. is 'd' ie Usually seen in acidic urine " Struvite stone tends to grow in alkaline urine * esp. when proteus organisms are present which split urea to ammonia" Types of Renal CalculusCalcium oxalate calculus (Most common*) they have hard, small and jagged surfacePhosphate calculus calcium phosphate but can be combined with ammonium and magnesium to form the triple phosphate calculus * ie Calcium ammonium magnesium phosphate also k/a struvite stones. smooth and dirty white and solitary*.seen in alkaline urine esp with proteus infection which split urea to ammonia. this type of calculus may enlarge to fill all or most of the renal collecting system forming a staghorncalculus*.Uric acid and urate calculus these are radiolucent*Form in acidic urine - Most responsive to lithotripsyCystein stones uncommon, seen in cystinuria appear only in acidic urine*they are pink to yellow when first removed but they change colour to a greenish hue when exposed to air. extremely hard stones are relatively resistant to fragmentation by ESWLXanthine calculi are radiolucent*are secondary to a congenital deficiency of xanthine oxidaseIndinavir calculiIndinavir is a protease inhibitor used in AIDS patients. It results in calculi in ~6% pt. who use. Indinavir. Indinavir calculi are radiolucent.Rare CalculiSilicate stones associated with the long term use of antacids containing silicaTriamterene stones associated with antihypertensive medications containing triamterene are radiolucent