Pathology · single question
Patient with gout taking allopurinol. What substance is deposited in the TMJ?
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Correct answer: C. Uric acid (monosodium urate) crystals
Gout: hyperuricemia → MONOSODIUM URATE crystal deposition in joints (podagra). TMJ is a less common but recognized site. Allopurinol = xanthine oxidase inhibitor, reduces uric acid production. Calcium pyrophosphate = pseudogout.