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Published on: April 3, 2011
Thymofibrolipoma in a labrador retriever
1Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA jrtobias@ncsu.edu.
Veterinary Pathology
|September 12, 2013
Summary
This study reports a rare canine thymofibrolipoma, a mediastinal tumor. The findings detail a unique variant with specific cellular characteristics in a Labrador Retriever.
Area of Science:
- Veterinary Pathology
- Comparative Oncology
- Thoracic Oncology
Background:
- Thymomas are mediastinal tumors, with collagen-rich variants like thymofibrolipoma being exceptionally rare in both human and veterinary medicine.
- Thymofibrolipoma has been infrequently documented in canine pathology.
- Recent recognition of thymofibrolipoma and sclerosing thymoma highlights evolving classifications of thymic neoplasms.
Observation:
- A cranial thoracic mass was identified in a 6-year-old Labrador Retriever.
- Histopathological examination revealed a robust collagenous stroma with cytokeratin-positive neoplastic epithelial cells.
- The tumor exhibited mildly pleomorphic epithelial cells, lymphocytic aggregates, and rare Hassall corpuscles.
Findings:
- This case represents the second reported instance of thymofibrolipoma in veterinary medicine.
- It is the first report describing a thymofibrolipoma variant with a mitotically active and pleomorphic adjacent thymic epithelial population.
- The neoplastic epithelial cells were positive for cytokeratin, confirming their thymic origin.
Implications:
- This case expands the understanding of rare thymic neoplasms in dogs.
- The description of a novel variant may influence future diagnostic criteria and treatment strategies for canine thymomas.
- Further research into the biological behavior and potential therapeutic targets for these rare tumors is warranted.
