However, it might be a derived from the embryonic remnants such as thyroglossal duct or branchial clefts.

Pictures and Imaging of Branchial Cleft Cysts (Page 2)

Branchial cleft cysts are remnants of embryonic development and result from a failure of obliteration of one of the branchial clefts, which in fish develop into gills.

A branchial cleft cyst is a congenital epithelial cyst that arises on the lateral part of the neck due to failure of obliteration of the second branchial cleft in embryonic development.