<prompt> All are true about cystic hygroma except ?Aspiration is diagnostic50 present at bihPresents as posterior cervical swellingSequstration of lymphatic tissue  <response>: Answer is a i.e. Aspiration is diagnostic Sabiston writes Roughly 50 to 65 of hygromas prsent at bih, with most becoming apparent by the second year of life. About option a - I have looked in Schwaz, Sabiston, CSDT, Nelson Bailey. Nowhere its written that aspiration is needed for diagnosis. 