<unk> s are malformations of the lymphatic system characterized by lesions that are thin-walled cysts; these cysts can be macroscopic, as in a cystic hygroma, or microscopic. The lymphatic system is the network of vessels responsible for returning to the venous system excess fluid from tissues as well as the lymph nodes that filter this fluid for signs of pathogens. These malformations can occur at any age and may involve any part of the body, but 90% occur in children less than 2 years of age and involve the head and neck. These malformations are either congenital or acquired. Congenital<unk> s are often associated with chromosomal abnormalities such as Turner syndrome, although they can also exist in isolation.<unk> s are commonly diagnosed before birth using fetal ultrasonography. Acquired<unk> s may result from trauma, inflammation, or lymphatic obstruction. Most<unk> s are benign lesions that result only in a soft, slow-growing, "doughy" mass. Since they have no chance of becoming malignant,<unk> s are usually treated for cosmetic reasons only. Rarely, impingement upon critical organs may result in complications, such as respiratory distress when a<unk>  compresses the airway. Treatment includes aspiration, surgical excision, laser and radiofrequency ablation, and sclerotherapy.
Lymphangioma
Hemangioma
Angioma
Lymphohemangioma
Chorangioma
Chorioangioma
Tufted angioma
Cavernous hemangioma