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The four images show the morphologic variability and irregularity of DHA crystals from the urine of our patient. Occasional crystals were still evident after the commencement of allopurinol treatment. Note the clustering and irregular shapes of the crystals, which resemble occasionally round urate crystals. Sternheimer supravital staining (Alcian blue-pyronin B) creates the brownish color (bright field image). Original magnification, ×400.
