<prompt> Which of the following is not true about acute retropharyngeal absess:DysphagiaSwelling on posterolateral wallToicollisCaries of cervical spine is usually a common cause  <response>: MC cause acute retropharyngeal abscess in children is suppuration of retro pharyngeal lymphnodes secondary to infection of adenoids, nasopharynx and nasal cavity. The MC cause of acute retropharyngeal abscess in adutls is penetrating injury of posterior pharyngeal wall or cerivcal esophagus. 