Photomicrograph showing urine sediment of a patient with acyclovir crystalluria

(A) Brightfield microscopy.
(B) Polarized microscopy.

Courtesy of Mark Perazella, MD, FACP. Reproduced with permission of the American Society of Nephrology. This image originally appeared as the cover photo of the September 2016 issue of CJASN: Clinical Journal of the American Society of Nephrology.

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