Answer :USMLE step 2 Mcq 154:A 55 year old Caucasian male visits his general practitioner complaining of pain in his left knee




Correct Answer: D

pseudogout:calcium pyrophosphate dihydrate deposition disease ; the disease most commonly presents itself as an osteoarthritis (50%). Other manifestations include acute synovitis (20%) rheumatoid form (5%) and cartilage calcification chondrocalcinosis);Features seen most commonly in the knee joints, include chondrocalcinosis; articular space narrowing, atlantoaxial subluxation,destructive wrist arthropathy and Charcot like joints .(Multiple sclerosis, syringomyelia and leprosy are all causes of actual Charcot joints because they are associated with a loss of sensation.) The lab findings of crystals found within leukocytes giving a weakly positive birefringent diffraction pattern are a characteristic finding


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