Calcium oxalate crystals in the urine
Urine sediment showing both dumbbell-shaped calcium oxalate monohydrate (long arrow) and envelope-shaped calcium oxalate dihydrate (short arrows) crystals. Although not shown, the monohydrate crystals may also have a needle-shaped appearance. The formation of calcium oxalate crystals is independent of the urine pH.
Courtesy of Frances Andrus, BA, Victoria Hospital, London, Ontario.
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