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Journal of Veterinary Diagnostic Investigation, Vol 15, Issue 1, 54-56
Copyright © 2003 by American Association of Veterinary Laboratory Diagnosticians

Case Reports

Dermal malignant melanoma in a horse with multifocal pancytokeratin expression

JC Patterson-Kane and PE Ginn

Livestock Disease Diagnostic Center, Department of Veterinary Science, University of Kentucky, 1429 Newtown Pike, Lexington, KY 40511, USA.

The current report describes a malignant melanoma in the dermis of a 13-year-old bay Thoroughbred mare. Microscopic examination revealed that tumor cells were arranged in cords and packets within an abundant collagenous stroma containing scattered myxomatous foci. Tumor cells stained positively for S-100, neuron-specific enolase, and vimentin and some contained melanin granules. Some clusters of tumor cells were also positive for pancytokeratin. Expression of epithelial cell markers has been described in small numbers of human melanomas but has not been reported previously in equine melanomas.




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