Fetal nuchal cystic hygromas (NCH) are congenital malformations of the lymphatic system and can be defined as an area of sonolucency in the soft tissue of the occipital region, consisting of two symmetrical cavities completely separated by a midline septum (nuchal ligament), with or without internal trabeculae (multiloculated cysts). Diagnosis can be made at first trimester of pregnancy using v...