An adult male domestic shorthair cat was presented for vomiting and anorexia, with a three-month history of weight loss. Bradycardia was documented during physical examination and was diagnosed as sinusal by electrocardiography. Blood electrolytes analysis revealed a marked ionised hypercalcaemia. Thoracic radiographs revealed a large soft tissue opacity at the level of the distal oesophagus. Subsequent thoracic ultrasonography and oesophagoscopy confirmed the presence of a tissue mass infiltrating distal oesophagus, oesophagogastric junction and neighbouring tissues. After biopsy and histopathological analysis, a squamous cell carcinoma (SCC) was diagnosed. Sinus bradycardia was assumed to be related to an increased vagal tone due to the close proximity of the vagal nerve with the infiltrative lesion or, less likely, severe hypercalcaemia. This case describes an atypical clinical presentation of an SCC in an uncommon location. Furthermore, to the authors’ knowledge, this is the first report of hypercalcaemia associated with oesophageal SCC in a cat.
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Contributors All authors certify that they have participated sufficiently in the work to take public responsibility for the content, including participation in: drafting the work: all authors; revising it critically for important intellectual content: all authors; final approval of the version to be published: all authors.
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.
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Data availability statement All data generated or analysed are included in this published article. No additional data is available.
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