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Polypoid uterine leiomyosarcomas in a sheep
Vimala Vemireddi1, Ingeborg M Langohr, Herbert L Thacker
1Purdue University, School of Veterinary Medicine, Animal Disease Diagnostic Laboratory, 406 South University Street, West Lafayette, IN 47907, USA. vemireddyvimala@yahoo.com
Summary
A rare uterine leiomyosarcoma was diagnosed in a young Suffolk ewe presenting with vulvar bleeding and lactation. This veterinary cancer involved multiple polypoid masses within the uterus.
Area of Science:
- Veterinary Pathology
- Ovine Oncology
- Somatic Neoplasia
Background:
- Uterine tumors are uncommon in ewes.
- Leiomyosarcomas arise from smooth muscle tissue.
Observation:
- A 3-year-old Suffolk ewe presented with vulvar bleeding, spontaneous lactation, and nursing behavior.
- Surgical removal revealed a uterus with multiple intraluminal polypoid masses (0.5-4 cm).
Findings:
- Histopathology showed sheets of spindle cells with moderate atypia and variable mitotic activity.
- Immunohistochemistry confirmed neoplastic cells expressed alpha-smooth muscle actin (alpha-SMA).
- Ultrastructural analysis revealed features consistent with smooth muscle differentiation.
Implications:
- This case highlights uterine leiomyosarcoma as a differential diagnosis in ewes with reproductive abnormalities.
- Accurate diagnosis relies on morphology, mitotic index, and immunohistochemical markers like alpha-SMA.
- Further research into the etiology and behavior of uterine leiomyosarcomas in livestock is warranted.
