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Trichoblastoma(毛母细胞瘤):Histopathologic Features:Well-demarcated from surrounding tissue Symmetric Basaloid epithelial proliferation in cords, sheets, or discrete clusters Fibrotic investment of epithelium Follicular germinative epithelium Peripheral palisading of nuclei Follicular differentiation resembling hair bulbs and papillae Keratinous cysts on occasion Fibrotic stroma
Occasional necrosis Limited numbers of mitoses
Differential Diagnosis Basal cell carcinoma