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Large heterogeneous mass centred in the retropharyngeal/prevertebral space, extending from skull base to C6 level. Pharynx and parapharyngeal space is displaced anteriorly, and the carotid space is displaced laterally, with enhancement surrounding the internal carotid artery. Longus colli appears involved. It is mildly heterogeneous with an overall high T2 signal with low T2 septae, and vivid post-contrast enhancement.