Atypical junctional melanocytoma with pagetoid spreading in a young horse
- L. Sonck
- M. Haspeslagh
- R. Ducatelle
Abstract
Melanocytic tumors are commonly encountered neoplasms in horses. In this case report, an atypical case of a melanocytoma in an almost five-year-old Andalusian horse is described. Histopathological examination showed a striking epidermal component consisting of multifocal to miliary nests of epitheloid cells, which were spread discontinuously in all layers of the epidermis, including the outer root sheath of the hair follicles. This phenomenon is called pagetoid spreading or buckshot pattern and is a feature of multiple human neoplasms, among which are melanomas, Paget disease and Bowen’s disease. To the authors’ knowledge, this is the first case report to describe pagetoid spreading in an equine melanocytic tumor.
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