History A 15-year-old male patient presented with a 3-week history of inner left thigh pain provoked by activity and experienced occasionally at rest. The patient denied nighttime pain, fever, or chills. Laboratory investigation revealed the following normal values: hemoglobin level of 15.6 g/dL (normal range, 13–16 g/dL), platelet count of 240 × 103/µL (normal range, 140–440 × 103/µL), and total leukocyte count of 7100 cells/µL (normal range, 4500–11 000 cells/µL). The percentage of neutrophils was considered low at 44% (normal range, 54%–62%), and the percentage of eosinophils was slightly high at 3.7% (normal range, 0%–3%). An anteroposterior radiograph of the left hip is shown. Physical therapy was initiated, with no improvement after 2 weeks of therapy. The patient was referred to an orthopedist for further evaluation. At physical examination, the patient endorsed marked left hip pain with hip flexion to 90°, limited internal and external rotation (5° and 15°, respectively), and antalgic gait favoring the left leg. Hip MRI and further serologic analysis were requested for further evaluation. Although the serologic testing was performed at an outside laboratory, the physician r
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