患者男，48岁。因吞咽哽噎感半年来院就诊，目前仅能进半流质食物。查体:稍消瘦，锁骨上未扪及肿大淋巴结。食管吞钡X线片示食管中下段4cm长之局限性管壁僵硬，黏膜部分中断，钡剂尚能通过。首先考虑的诊断是

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