A 55-year-old woman with no significant past medical history presents to the office with complaints of hoarseness and a subtle feeling of pulsating in the back of her throat. Pharyngeal examination shows a submucosal pulsating mass in the posterior pharynx. What is the most likely etiology of this mass?

1.Retropharyngeal internal carotid artery
2.Retropharyngeal internal jugular vein
3.Retropharyngeal abscess
4.Retropharyngeal lipoma

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