What is the difference between a branchial cleft cyst and a cystic hygroma?
a) Branchial cleft cyst: lateral neck; Cystic hygroma: posterior neck
b) Branchial cleft cyst: anterior neck; Cystic hygroma: lateral neck
c) Branchial cleft cyst: posterior neck; Cystic hygroma: lateral neck
d) Branchial cleft cyst: lateral neck; Cystic hygroma: midline neck