患者,男,20岁,左下颌骨肿大半年,X线见泡沫状阴影。病理检查见大小不等的海绵状血腔,其间有纤维组织,伴有新旧出血,出血区见有多核巨细胞。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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