<prompt> Renal calculi associated with proteus infection?A.Uric acidB.Triple phosphateC.Calcium oxalateD.Xanthine  <response>: Urease producing organisms eg :- proteus ,psuedomonas , and staphylococcus , break down urea to produce ammonia and CO2.The urine becomes alkaline which promotes formation of struvite calculi magnesium ammonium phosphate which grow to become staghorn calculi.E coli never forms struvite stones. Struvite occupying pelvi-calyceal system:- TYPES:1.Complete- occupancy of 80of pelvi- calyceal system. 2.Incomplete:- Occupancy of atleast 2 pelvicalyceal system. ref :- Bailey and Love 27th edition .chapter 72 . pg no 1406 