Cystic HygromaThe cystic hygroma is a lymphatic lesion composed of a cluster of cysts that can appear in almost any area of the body, although it usually affects the head and neck (about 75%), most often on the left side. Cystic hygromas (CH) are also termed cystic lymphangiomas or macrocystic lymphatic malformations. The majority (over 50%) are seen at birth and about 80% to 90% present by 2 years of age. The microcystic form is comprised of cysts that are less than 2 centimeters while the macrocystic form comprises cysts greater than 2 centimeters.