A 6-year-old girl is brought to the physician because of a 1-week history of joint pain and swelling, intermittent rash, and fever. She’s had four similar episodes during the past 2 years. Temperature is 102.8 F (39.4 C). Physical examination shows a diffuse maculopapular rash on the trunk and all four extremities. There are several swollen, warm interphalangeal joints. Which of the following is most likely to be saliently seen in the synovium?
Basic calcium phosphate crystals
Calcium pyrophosphate crystals
Gram-positive bacteria
Leukocytes
Monosodium urate crystals
