A 16-year-old sexually intact male Cocker Spaniel was referred for fluoroscopy and esophagogastroduodenoscopy to investigate a 6-week history of ptyalism and regurgitation. Gastrointestinal tract obstruction was suspected.
At the referral evaluation, the dog was responsive and in good body condition (body condition score, 5/9). Two orthogonal radiographic views obtained by the referring veterinarian revealed a radiodense, well-demarcated, space-occupying mass within the cranial aspect of the thorax at the level of the T2-T4 vertebrae. The dog was anesthetized to perform fluoroscopic and upper GI endoscopic examination. The presence of a 4.1 × 2.5 × 3.1-cm,