Cystic hygroma

Discussion:

A cystic hygroma refers to a type of congenital lymphangioma (lymphovascular malformation). The estimated prevalence in the fetal population is at ~0.2-3 %

They occur most commonly in the neck - which is then also termed nuchal cystic hygroma (occurs in ~ 80% of cases) and axilla, with only 10% of cases extending to the mediastinum and only 1% confined to the chest. 

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