Surgical exploration of the thorax revealed a multi-lobulated red/brown cranial mediastinal mass and multiple similarly coloured ovoid nodules within several lung lobes.
Histopathology revealed thymic branchial cysts with neoplastic transformation and examination of the lung was consistent with metastasis.
Despite initially recovering well, acute sepsis and pyothorax resulted in cardiac arrest 8 days postoperatively.
This is the first veterinary report of neoplastic transformation of a thymic branchial cyst with pulmonary metastasis.
Source: Levien, A. S., Summers, B. A., Szladovits, B., Benigni, L. and Baines, S. J. (2010), Transformation of a thymic branchial cyst to a carcinoma with pulmonary metastasis in a dog. Journal of Small Animal Practice, 51: 604–608. doi: 10.1111/j.1748-5827.2010.01006.x
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