<prompt> True about cystic hygroma -Congenital sequestration of lymphaticsResolves spontaneouly by 5 year of ageCommon in upper 13rd of lateral neckAll  <response>: Answer is a i.e. Congenital sequestration of lymphatics Bailey writes that spontaneous regression may occur in cystic hygroma but I am not sure whether it occurs by 5 yrs of age. 