Abstract: Fetal abdominal masses detected by prenatal ultrasound should be considered as either neoplastic or non-neoplastic masses. The location of the masses，echo properties，Doppler flow，calcification type（focal or isolated）and whether they are accompanied by other structural malformations should be examined in detail. Interventional prenatal diagnosis should be conducted if necessary. Abdominal solid masses should be considered as fetal tumors，though rare，usually originating from liver and retroperitoneal organs. Abdominal cyst usually originates from the reproductive system，followed by the digestive system. When ultrasound diagnosis is unclear，fetal MRI should be considered to assist diagnosis. According to the location and severity of the abdominal masses，prenatal and postpartum management strategies can be formulated by multidisciplinary diagnosis and treatment team.

Key words: fetal tumor, fetal abdominal cyst, fetal abdominal mass, prenatal diagnosis

摘要： 产前超声发现的腹腔内异常回声，应考虑赘生性或非赘生性肿物。需详细检查肿物所处部位、回声性质、动静脉血供、钙化类型（局灶性或散在）以及是否伴发其他结构畸形，必要时行介入性产前诊断。腹腔内实性肿物应考虑胎儿肿瘤可能，虽然罕见，常来源于肝脏及后腹膜器官。腹腔内囊性占位常来源于生殖系统，其次是消化系统。当超声诊断不清时应考虑磁共振成像检查协助诊断。胎儿预后可根据肿物部位、严重程度进行多学科诊疗，制定产前及产后管理策略。

关键词: 胎儿肿瘤, 胎儿腹腔囊肿, 腹腔异常回声, 产前诊断