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Photograph of the infected staghorn calculus. On gross examination, calculus took the form of tan-yellow, bosselated stone with loosely adherent blood clots. Crystallographic analysis (Louis C. Herring and Company) revealed calculus composition of 67% magnesium-ammonium-phosphate-hexahydrate (struvite) and 30% calcium phosphate in carbonate form, calculus culture grew Pseudomonas aeruginosa.
