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Cranial mediastinal liposarcoma in a horse
H Kondo1, S C Wickins, J A Conway
1Department of Infectious Diseases and Pathology, College of Veterinary Medicine, University of Florida, 2015 SW 16th Ave, Gainesville, FL 32608, USA. kondoh@ufl.edu
Veterinary Pathology
|January 31, 2012
Summary
A liposarcoma, a type of fatty tumor, was found in the mediastinum of an Anglo-Arabian mare. This rare tumor caused respiratory distress and swelling in the horse.
Area of Science:
- Veterinary Pathology
- Equine Neoplasia
- Soft Tissue Sarcomas
Background:
- Liposarcomas are malignant tumors originating from adipose tissue.
- Mediastinal masses in horses can cause significant cardiorespiratory compromise.
- Anglo-Arabian horses, while not predisposed, can be affected by various neoplasms.
Observation:
- A 23-year-old mare presented with severe respiratory distress (tachypnea, dyspnea) and ventral thoracic subcutaneous edema.
- Necropsy revealed a large (23 × 20 × 18 cm), friable, tan-to-red mass in the cranial mediastinum.
- Histological examination identified the mass as a liposarcoma.
Findings:
- The liposarcoma consisted of spindle-shaped to rounded cells with clear cytoplasmic vacuoles.
- Oil red O staining confirmed the presence of lipids within the vacuoles in frozen sections.
- The tumor's location and size were consistent with the observed clinical signs.
Implications:
- This case highlights liposarcoma as a differential diagnosis for mediastinal masses in horses.
- Early detection and surgical intervention may be crucial for improving prognosis in equine liposarcoma.
- Further research into the specific risk factors and treatment modalities for equine liposarcomas is warranted.
