Synovial fluid from a painful great toe contains needle-shaped crystals that are negatively birefringent under…

Question

Synovial fluid from a painful great toe contains needle-shaped crystals that are negatively birefringent under polarized light. Which condition is most likely?

Accepted Answer

보기 1: Gout caused by monosodium urate

Needle-shaped crystals with negative birefringence are monosodium urate crystals, the finding in gout. The calcium pyrophosphate crystals of pseudogout are rhomboid with positive birefringence. Learn crystal shape and birefringence direction as a pair.

Answer

보기 2: Pseudogout caused by calcium pyrophosphate

Answer

보기 3: Septic arthritis

Answer

보기 4: Osteoarthritis

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Synovial fluid from a painful great toe contains needle-shaped crystals that are negatively birefringent under polarized light. Which condition is most likely?

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