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A lucency is seen projected anterior to the C6/C7 intervertebral disc.
Upon swallowing, the lucency corrseponds with a large outpouching of the lateral oesophageal wall, with its neck arising from just inferior to the C6 vertebral body, with its most inferior extent extending to the T1 vertebral body.
The outpouching retains contrast after passage of contrast. It is smooth walled.