女,18岁。右股下端肿2个月余,表面静脉怒张,皮温略高;X线平片示右股骨下端有边界不清的骨质破坏区,骨膜增生呈放射状阴影。最可能的诊断是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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