This enlargement on the lateral neck of this patient has been present for months and is slowly increasing in size. It is painless and feels soft. Histologic examination shows this to be an epithelium-lined sac filled with clear, yellow fluid. It is a _____ cyst.

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A thyroglossal duct cyst appears on the lateral neck and slowly increases in size. It is painless and feels soft. Histologic examination shows an epithelium-lined sac filled with clear, yellow fluid. A branchial cleft cyst is located on the lateral neck at the anterior border of the sternocleidomastoid muscle. A median palatine cyst is a well-defined unilocular radiolucency located in the midline of the hard palate. A globulomaxillary cyst is a well-defined, pear-shaped radiolucency found between the roots of a maxillary lateral incisor and cuspid.

This Enlargement on the Lateral Neck of This Patient Has