[Staghorn silicate calculi: a case report].

A 71-year-old woman complaining of fever and left flank pain was referred to our hospital. She had no history of taking any silicate-containing antiacids. She was diagnosed with left staghorn renal stone and repeated extracorporeal shock wave lithotripsy was performed. Analysis of the stones revealed silica calculi. Forty-nine cases of silica calculi have been reported in Japan, but this is the first case of nearly pure staghorn silicate calculi.