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A, Scanning magnification: Papillated epidermal hyperplasia, full-thickness squamous atypia, and overlying compact hyperkeratosis with parakeratosis and a dermal band-like inflammatory infiltrate. The surface epithelium revealed invaginations filled with parakeratosis that correspond to the clinical and dermoscopic white, oval-shaped projections (hematoxylineosin stain; original magnification: 380). B, Higher power magnification: Squamous atypia involving all cell layers of the epidermis and the prominent parakeratotic filled invaginations (hematoxylin-eosin stain; original magnification: 3250)

A, Scanning magnification: Papillated epidermal hyperplasia, full-thickness squamous atypia, and overlying compact hyperkeratosis with parakeratosis and a dermal band-like inflammatory infiltrate. The surface epithelium revealed invaginations filled with parakeratosis that correspond to the clinical and dermoscopic white, oval-shaped projections (hematoxylineosin stain; original magnification: 380). B, Higher power magnification: Squamous atypia involving all cell layers of the epidermis and the prominent parakeratotic filled invaginations (hematoxylin-eosin stain; original magnification: 3250)

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... demonstrated papillated epidermal hyperplasia, fullthickness squamous atypia, and overlying compact hyperkeratosis with prominent parakeratosis and a dermal, band-like, inflammatory infiltrate. The surface epithelium demonstrated invaginations filled with parakeratosis that corresponded to the clinical and dermoscopic firm, white, discrete, and oval-shaped projections (Fig 3, A and B). The diagnosis was SCC in situ. ...