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Old 03-22-2019
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Default Repeated USMLE Questions Step 1- 458

A 56- year old man presents to the clinic due to recurrent attacks of severe pain in his right big toe for the last few weeks. During the attacks, his toe becomes painful, red, warm and swollen. Significant improvement occurs after treatment with colchicine. Synovial fluid analysis is performed to confirm the diagnosis.
What is the most likely finding to confirm the diagnosis?
A- Calcium oxalate crystals
B- Calcium pyrophosphate dehydrate crystals
C- Cholesterol crystals
D- Cloudy, reddish fluid, with leucocytes’ count equal to the blood count
E- Negatively birefringent urate crystals
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