患者,女,58岁。右侧肢体偏瘫伴眩晕半小时,查体示:血压100/65mmHg,左腋下一肿大淋巴结,气管左偏,左上胸塌陷。既往无高血压病史,3个月前因咯血在外院考虑左上肺结核可能。CEA明显增高。最可能的原因是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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