Examination of joint fluid on a 60-year-old patient with right knee pain reveals many intracellular needlelike crystals that polarize yellow to blue. What is the most likely identification of the crystal?
A) Calcium pyrophosphate
B) Cholesterol crystal
C) Monosodium urate
D) Talc particle

Question

Quizplus · Accepted Answer

Monosodium urate crystals are identified by their needle-like shape and strong negative birefringence, appearing yellow when aligned parallel to the polarized light axis and blue when perpendicular, which is characteristic of gout.

Examination of Joint Fluid on a 60-Year-Old Patient with Right