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Amyloid deposition in 2 feline thymomas
E R Burrough1, R K Myers, S J Hostetter
1Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames, IA, USA. burrough@iastate.edu
Veterinary Pathology
|March 9, 2011
Summary
Two feline thymoma cases showed unusual amyloid deposition. This amyloid, produced by neoplastic epithelial cells, was identified as non-AA amyloid.
Area of Science:
- Veterinary Pathology
- Oncology
- Biochemistry
Background:
- Thymomas are neoplasms of the thymus gland, more common in younger animals.
- Amyloidosis is a condition characterized by the extracellular deposition of misfolded proteins (amyloid).
- Feline thymoma is a rare condition, and amyloid deposition within these tumors is exceptionally uncommon.
Observation:
- Two cases of feline thymoma exhibited significant intratumoral amyloid deposition.
- The amyloid material stained positively with Congo red and showed birefringence.
- Ultrastructural analysis revealed nonbranching, hollow-cored fibrils consistent with amyloid.
Findings:
- Histochemical and immunohistochemical analyses confirmed the neoplastic nature of the epithelial cells and the presence of amyloid.
- The amyloid retained its Congo red affinity after potassium permanganate treatment, suggesting a non-serum amyloid A (non-AA) type.
- Neoplastic epithelial cells were immunoreactive for pancytokeratin, supporting an epithelial origin.
Implications:
- This study highlights an unusual presentation of feline thymoma with intratumoral amyloid.
- The findings suggest that neoplastic epithelial cells in feline thymoma can produce amyloid.
- Further research is needed to understand the pathogenesis and clinical significance of amyloid deposition in feline thymoma.
