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Keywords:

  • horse;
  • mare;
  • mammary gland;
  • sarcoma;
  • malignant fibrous histiocytoma;
  • mastectomy

Summary

Mammary tumours are uncommon in mares. Sarcomas of the breast account for less than 1% of all human primary malignancies and, among these types of tumours, malignant fibrous histiocytoma (MFH) is very rare. This report describes a 6-year-old uniparous Paint mare that was presented for investigation of right mammary gland enlargement of 3 weeks' duration. The clinical and histopathological findings in this mare with malignant fibrous histiocytoma of the mammary gland as well as complications of bilateral mastectomy are detailed. At one year follow-up there were no clinical signs of recurrence.