Haired skin, Inverted viral papilloma, dog. (Hematoxylin and Eosin-40x)
Expanding the dermis is a well circumscribed, unencapsulated, endophytic (bowl-shaped), epithelial neoplasm that compresses and displaces adnexal structures. Neoplastic cells are arranged in broad infolds and papillary projections supported by a thin fibrovascular core.

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