A 17-year-old female Siamese cat was referred for a history of progressive dyspnoea, depression and anorexia. The cat was tachypnoeic, dyspnoeic and the thoracic auscultation revealed muffled cardiac and respiratory sounds. Radiographs of the thorax demonstrated pleural effusion and a well-circumscribed soft tissue mass in the caudodorsal aspect of the mediastinum, most likely consistent with an oesophageal mass. CT findings demonstrated a cystic-like mass in the caudal mediastinum, which was located in the right wall of the oesophagus, pleural effusion and subpleural nodules. Microscopic examination revealed that the wall of the cystic-like mass had an inner mucosal layer lined by squamous epithelium and contained two muscle layers, consistent with an oesophageal duplication cyst (ODC). A carcinoma was found in the ODC as well as pleural carcinomatosis. To the authors’ knowledge, this is the first case of a neoplastic ODC.
- malignant transformation
- computed tomography
- duplication cyst
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Contributors Conception and design: AA, MS. Acquisition of data: AA, MS, JC, MAG, MJF. Analysis and interpretation of data: AA, MAG, MJF. Drafting the article: AA, MS, MJF. Revising article for intellectual content: AA. Final approval of the completed article: AA, MS, JC, MAG, MJF.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Data availability statement All data relevant to the study are included in the article.
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