以下为句子列表：
英文: It is difficult to manage arteriovenous malformations or fistulas of the face because of the abundant vascular network in this region.
中文: 摘要脸部动静脉畸型或瘻管因为内含大量血管网，导致很难处理。
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英文: Most tracheoesophageal fistulas are caused by congenital anomalies and only a few cases are acquired (eg. esophageal cancer, foreign body).
中文: 摘要过去气管食道瘻管大多由先天性姿育异常所造成的，只有少数病例是后天形成（如食道癌、异物）。
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英文: Results Immediate angiography after embolization showed all the arteriovenous fistulas and hemangiomas were efficiently occluded and the clinical presentation and symptoms improved greatly.
中文: 结果栓塞治疗后造影证实，动静脉瘻和血管瘤均得到有效闭塞，临床症状、体徵迅速改善，术后1~3年观察随访，治疗有效率100%，治愈率68.7%。
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