When the second branchial groove occasionally does not become obliterated,it has parts that remain after cervical development and can form a:

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The second branchial grooves occasionally do not become obliterated,and thus parts remain to form a branchial cleft cyst.These cysts may drain through sinuses along the neck but may also remain free in the lateral neck tissue to produce a slowly enlarging painless swelling that may be associated with small pits and skin tags that may involve fluid drainage from a sinus tract.The branchial apparatus consists of the branchial arches,branchial grooves and membranes,and pharyngeal pouches.

When the Second Branchial Groove Occasionally Does Not Become Obliterated,it