Category: Nephrology

Dec 19 2011

Bury the Buzzword: Envelope Crystals

This buzzword refers to the appearance of calcium oxalate dihydrate crystals that can be found in the urine of patients with ethylene glycol toxicity, or kidney stones (nephrolithiasis). They look like squares with an “X” in the center, which appear similar to a mail envelope. The “envelope” appearance is specific to the calcium oxalate dihydrate …

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