Cranial mediastinal liposarcoma in a horse.
Authors: Kondo H, Wickins S C, Conway J A, Mallicote M F, Sanchez L C, Agnew D W, Farina L L, Abbott J R
Journal: Veterinary pathology
Summary
# Editorial Summary: Cranial Mediastinal Liposarcoma in a Horse A 23-year-old Anglo-Arabian mare presented with respiratory distress and ventral thoracic oedema, findings subsequently attributed to a large mediastinal mass identified at necropsy. Histopathological examination—including oil red O staining of frozen sections—confirmed the 23 × 20 × 18 cm lesion as a liposarcoma, a malignant lipocytic tumour composed of spindle-shaped and irregularly rounded cells with characteristic lipid-filled vacuoles. Whilst liposarcomas occur commonly in humans and dogs, this case represents a rare presentation in equine practice, where primary mediastinal neoplasia remains uncommon and frequently goes undiagnosed ante-mortem. The clinical signs of progressive dyspnea and cranial thoracic oedema warrant consideration of mediastinal pathology in differential diagnoses, particularly when conventional investigations prove inconclusive. For practitioners managing horses with unexplained respiratory compromise or atypical thoracic swelling, awareness of this tumour type—though rare—may inform imaging decisions and prognostic discussions with owners.
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Practical Takeaways
- •Cranial mediastinal masses should be considered in differential diagnosis for horses presenting with progressive dyspnea, tachypnea, and ventral thoracic edema
- •Liposarcoma is a rare mediastinal tumor in horses; clinical signs reflect mass effect on respiratory structures rather than systemic disease
Key Findings
- •23-year-old mare presented with respiratory distress and ventral thoracic edema caused by a large cranial mediastinal liposarcoma (23 × 20 × 18 cm)
- •Histological examination confirmed liposarcoma composed of spindle-shaped to irregularly rounded cells with lipid-filled vacuoles staining positive with oil red O