A 62-year-old man presented with a 5-day history of low back pain and a 1-day history of lethargy. Physical examination was notable for tenderness over the lumbar spine and a normal neurologic examination. Radiographs of the lumbar spine showed gas within L4. Computed tomography of the lumbar spine confirmed the presence of intramedullary gas within L4, and also showed that the gas extended into the surrounding soft tissue, epidural space, and psoas muscles. What is the most likely etiology of this skeletal finding?一位62岁的男性患者因腰痛5天、嗜睡1天就诊。体格检查发现腰部有压痛，神经系统检查正常。腰椎X光显示L4椎体内有气体。腰椎CT检查确认L4椎体内髓腔有气体，并且气体还扩散至周围软组织、硬膜外间隙和腰大肌。这种骨骼表现的最可能病因是什么？
A. Air embolism空气栓塞
B. Calcium oxalate crystal deposition草酸钙晶体沉积
C. Emphysematous osteomyelitis气肿性骨髓炎
D. Iatrogenic医源性
E. Osteonecrosis骨坏死
答案解析：
腰椎磁共振成像显示了髓内气体，以及一个含有气体的硬膜外脓肿，该脓肿导致马尾神经受到轻度压迫。血液、痰液和尿液培养结果显示为产超广谱β-内酰胺酶的肺炎克雷伯菌感染。最终诊断为由播散性肺炎克雷伯菌感染引起的气肿性椎体骨髓炎和硬膜外脓肿
正确答案：C
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