Hyoid bone is closely associated with -
Bronchiogenic cyst
Cystic hygroma
Thyroglossal cyst/fistula
Branchial cyst
Hyoid bone is closely associated with the thyroglossal tract from which thyroglossal cyst & fistula originate, thus during surgical excision of the thyroglossal cyst or fistula, the central part of the hyoid bone is excised (otherwise recurrence may occur).