Not sure: Exact incidence is still unknown; however it is a common cause of congenital neck masses. No ethnic preferences for branchial cysts are reported. Clusters of cases can be found in families. No sexual predilection for branchial cysts are recognized. Branchial cleft cysts are congenital in nature, but they may not be noticed until later in life, usually by adulthood.
Answered 3/25/2015
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