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    Image of epithelium hyperplasia in the ear from a male F344/N rat in a chronic study
    Ear, Epithelium - Hyperplasia in a male Fischer 344/N rat from a chronic study. There are increased layers of squamous epithelial cells with some rete peg formation is present; a large aggregate (asterisk) of cerumen and necrotic cell debris is also present.
    Image of epithelium hyperplasia in the ear from a male F344/N rat in a chronic study
    Ear, Epithelium - Hyperplasia in a male Fischer 344/N rat from a chronic study. The exophytic, papillary projections of squamous epithelium in the external ear canal (arrow) represent focal hyperplasia.
    Image of epithelium hyperplasia in the ear from a male F344/N rat in a chronic study
    Ear, Epithelium - Hyperplasia in a male Fischer 344/N rat from a chronic study. There is a complex papillary pattern of squamous epithelial hyperplasia in the external ear canal.
    Image of epithelium hyperplasia in the ear from a male F344/N rat in a chronic study
    Ear, Epithelium - Hyperplasia in a male Fischer 344/N rat from a chronic study (higher magnification of Figure 3). Hyperkeratosis and chronic-active inflammation accompany the squamous epithelial hyperplasia.