Acute Gout (Monosodium Urate Crystals)
Polarized light microscopy showing monosodium urate crystals. Note the negative birefringence (yellow) of needle-shaped crystals versus the rhomboid-shaped and positively birefringent (blue) crystals of crystal pyrophosphate disease (CPPD). (Courtesy Dr. A. Fam)
Crystals – Gout