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Right knee arthrocentesis reveals 55,000 WBCs, 80% PMNs, Gram stain negative, and the presence of needle-shaped negatively birefringent crystals in PMNs. Culture at 48 hours was negative. Serum ...
Numerous negatively birefringent needle-shaped monosodium urate crystals are detected by compensated polarized-light microscopy (original magnification ×40).
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