Large retropharyngeal/prevertebral abnormality extending from base of skull to the level of hypopharnx and demonstrates increased T2 signal and almost uniform contrast enhancement with areas of possible linear liquefaction/abscess formation.
As the alar fascia is not identifiable, it is unclear whether this abnormality is centred within the retropharyngeal space or danger space.
Conclusion:
Large retropharyngeal/prevertebral cellulitis/evolving abscess.