患者，女，21岁。停经6周，突发左下腹疼痛拒按，恶心、呕吐，査血β-HCG3054U/L。彩超:左卵巢下方见大小约6.9cmx2.4cmx5.1cm低回声区，内见胚褒样回声;盆腔可见4.1cmx2.5cm的液性暗区。该患者的治疗方法是

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