Which of the following is the treatment of choice of cystic hygroma?

Definitive treatment of cystic hygroma (cavernous lymphangioma) is excision of all of the cyst at an early stage. This is done by a meticulous conservative neck dissection with excision of all lymphatic-bearing tissues while preserving the normal neurovascular structures. Picibanil (OK432) is a sclerosing agent that can be injected into the lesion. This reduce the size of the lesion at the site of injection, but these lymphatic malformations are commonly multicystic and extensive so not very effective. Ref: Bailey and Love's Sho practice of Surgery, 24th Edition, Page 771.