Silica stones in the urinary bladder.
D000368:Aged; D006801:Humans; D008274:Magnesium / Q000009:adverse effects; D017633:Magnesium Silicates; D008297:Male; D008855:Microscopy, Electron, Scanning; D012824:Silicic Acid / Q000009:adverse effects*; D012822:Silicon Dioxide / Q000009:adverse effects* / Q000378:metabolism*; D013272:Stomach Diseases / Q000188:drug therapy; D001744:Urinary Bladder Calculi / Q000139:chemically induced / Q000378:metabolism*
D017633:Magnesium Silicates; D012824:Silicic Acid; D012822:Silicon Dioxide; C001671:magnesium trisilicate; D008274:Magnesium