Diagnosis????
What is most likely underlying diagnosis in this 82 years old patient with diabetes mellitus who had gone total hip replacement 10 years previously ? A. Colon cancer B. Hypogammaglobulinemia C. Osteosarcoma D. Tuberculosis E. Hypophosphatasia
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A. Free air extending lateral to the greater trochanter. Intra-articular cultures grew Clostridium septicum, which has a known association with colorectal cancer. Subsequent colonoscopy revealed a fungating colonic adenocarcinoma. It was in USMLE STEP base
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