Aortic body tumour with adjacent ectopic thyroid tissue in a dog

Area of Science:

• Veterinary Pathology
• Cardiovascular Oncology
• Comparative Oncology

Background:

• Neoplasms at the base of the heart in dogs can present diagnostic challenges.
• Distinguishing between various tumors, including aortic body tumors and ectopic endocrine tissues, is crucial for accurate diagnosis and treatment.

Observation:

• A 12-year-old male Husky presented with a cardiac base neoplasm.
• The tumor was microscopically characterized by nests and sheets of polyhedral cells within a fibrovascular stroma.
• Histological examination also revealed adjacent, normal-appearing ectopic thyroid tissue.

Findings:

• Differential diagnoses included aortic body tumor, ectopic thyroid tumor, and ectopic parathyroid tumor.
• Ultrastructural analysis confirmed the neoplasm to be an aortic body tumor.
• The tumor did not demonstrate invasion of surrounding cardiac tissues.

Implications:

• This case highlights the importance of detailed histopathological and ultrastructural examination for diagnosing cardiac neoplasms in dogs.
• Accurate identification of aortic body tumors is essential for understanding their behavior and prognosis in canine patients.
• The presence of ectopic thyroid tissue adjacent to the tumor provides insights into developmental anomalies or concurrent conditions.