All are true about cystic hygroma except ?
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.
Aspiration is diagnostic
50% present at bih
Presents as posterior cervical swelling
Sequstration of lymphatic tissue