Whats the reason of my cystic hygroma?

? bad luck: Lymphangioma develop in the neck, but they do develop as part of some syndromes, such as turner syndrome and down syndrome. If you have a syndrome it is a much higher chance of getting the tumor.

Cystic hygroma cause: Cystic hygromas are often present as a congenital defects, but they can develop at any time in an individual's life. A history, physical examination and chromosome testing would be needed to try to determine the specific cause for your cystic hygroma. Likely causes and extent of work-up to find cause, would depend on the age you are when the cystic hygroma is diagnosed.