What crystals are seen in gout and how do they appear under polarized light?

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Multiple Choice

What crystals are seen in gout and how do they appear under polarized light?

Explanation:
Gout is defined by deposition of monosodium urate crystals in joints. These crystals are needle-shaped and show negative birefringence under polarized light. When viewed with polarized light, they appear yellow if the long axis is parallel to the slow axis and blue if it is perpendicular. This needle shape with negative birefringence helps distinguish gout from pseudogout, whose crystals are rhomboid and positively birefringent (blue when parallel, yellow when perpendicular).

Gout is defined by deposition of monosodium urate crystals in joints. These crystals are needle-shaped and show negative birefringence under polarized light. When viewed with polarized light, they appear yellow if the long axis is parallel to the slow axis and blue if it is perpendicular. This needle shape with negative birefringence helps distinguish gout from pseudogout, whose crystals are rhomboid and positively birefringent (blue when parallel, yellow when perpendicular).

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