A 7-year-old intact male Rottweiler dog was evaluated for recurrent dysphagia and regurgitation.Physical examination was unremarkable and routine blood works were within normal limits. Computed tomographyrevealed a defined lesion in the caudal mediastinum arising from the oesophagus. The lesion was excisedusing intercostal thoracotomy and the histological diagnosis was oesophageal duplication cyst. The dog recovereduneventfully and at a 3-year follow-up no clinical signs were reported. Although extremely rare, oesophagealduplication cysts should be considered in the differential diagnosis in cases of chronic regurgitation and dysphagiaassociated with evidence of an oesophageal lesion.
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