CT head and neck on admission—pharynx: A 1.3 cm × 1.3 cm × 2.8 cm (AP × transverse × CC) fluid collection with foci of air at prevertebral retropharyngeal space (yellow) with adjacent periosteal reaction and bony destruction of the clivus (red). Unremarkable oropharynx and hypopharynx.Abbreviations: AP, anteroposterior; CC, craniocaudal; CT, computed tomography.