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The case presented here is a rare case of umbilical cord cyst detected in second trimester of pregnancy. Cystic masses of the umbilical cord are associated with fetal abdominal wall defects and chromosomal anomalies. 20% of umbilical cord cysts are associated with structural or chromosomal anomalies, especially trisomy 18 and 13. These are sometimes associated with increase risk of missed abortion. Their origin and significance must be considered for proper obstetric management.