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Struvite stones. Infection stones are commonly of large size, and thus usually appear for analysis as multiple fragments retrieved from a suction reservoir following endoscopy. A: Multiple fragments from a large stone, scanned en masse in a plastic container. Note that the X-ray attenuation of struvite is rather low, but struvite stones commonly also contain apatite. B: Higher resolution of a struvite stone fragment to show the typical microstructure of this type of stone.
