女，28岁。G2P1C停经2月余,阴道少量流血 10天。妇科检査:宫体如4个月妊娠大小。B型超声 显示宫腔内充满落雪状光点,未测到胎体和胎盘回声, 双附件区探及直径5 cm大小无回声包块。初步诊断是

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