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胎儿淋巴管畸形是淋巴系统异常发育性疾病，可发生在全身任何部位，颈部常见，其次为腋下。本文报告1例胎儿右侧腋下胸壁淋巴管畸形的病例。该病例孕21周常规超声检查时确诊胎儿右侧腋下胸壁淋巴管畸形，大小21 mm×18 mm×16 mm，后每隔4周复查超声，团块进行性增大，至37周n +4右侧腋下胸壁淋巴管畸形增大至101 mm×110 mm×95 mm，38周n +4时行超声引导下宫内胎儿囊性团块穿刺抽液术并注入博来霉素治疗，出生后42 d再次行博来霉素治疗。随访至生后10个月时，患儿右侧腋下胸壁未见明显囊性团块。n “,”Fetal cystic lymphangioma is a developmental anomaly of the lymphatic system, which can occur in any part of the body, but most commonly in the neck and armpit. A case of fetal cystic lymphangioma located at the chest wall under the right armpit with a size of 21 mm×18 mm×16 mm is reported here. The mass was initially diagnosed by routine ultrasound examination at 21 gestational weeks. After the diagnosis, ultrasound was repeated every 4 weeks till 37n +4 gestational weeks. Over this period, the mass increased progressively to 101 mm×110 mm×95 mm. Ultrasound-guided intrauterine fetal cystic mass puncture and aspiration was performed 38n +4 weekss, and Bleomycin was injected into the cyst after operation and on day 42 after birth. During a follow-up to 10 months after birth, no obvious cystic mass was found at the right axillary chest wall of the child.n