Cystic hygroma treatment of choice is -

Ans is 'a > b' i.e., Complete surgical excision > Injection sclerotherapy Treatment of cystic hygroma* There are two methods of treatment: Surgical excision & SclerotherapySabiston writes- "Complete surgical excision is the preferred treatment; however, this may be impossible because of the hygroma infiltrating within and around important neurovascular structures. Because hygromas are not neoplastic tumors, radical resection with removal of major blood vessels and nerves is not indicated.* Injection of sclerosing agents such as bleomycin or the derivative of Streptococcus pyogenes OK-432 have also been reported to be effective in the management of cystic hygromas. Intracystic injection of sclerosants appears to be most effective for macrocystichygromas, as opposed to the microcystic variety.""The modern management of most cystic hygromas includes the combination of surgical excision and image- guided sclerotherapy." -- Schwartz