is an abscess
located in the tissues in the back of the throat behind the posterior pharyngeal wall, which is the retropharyngeal space. Retropharyngeal abscesses
are relatively uncommon, and therefore may not receive early diagnosis in children presenting with stiff neck, malaise, difficulty swallowing, or other associated symptoms. The parapharyngeal space communicates with the retropharyngeal space and an infection of retropharyngeal space can pass down behind the esophagus into the mediastinum.