患者近来咽下不畅,食管钡餐检查侧斜位可见食管上段后壁有弧形压迫,粘膜皱壁规则,扩张度好,应考虑什么疾病?()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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