A Rare Cutaneous Adnexal Tumor: Malignant Proliferating Trichilemmal Tumor

Figure 1

A case of malignant proliferating trichilemmal tumor (H&E, ×100). Tumor cells designed in solid groups are observed. Trichilemmal keratinization (black arrow) at the center of the tumor islands is remarkable (a). The tumor cells with wide translucent cytoplasm are observed more remarkably (b). Atypical mitotic figures in the tumor are remarkable (white arrow) (c). A focal invasion field in the peripheral tumor is observed. The tumor is continuous along the surgical margin labeled by black tissue stain. The focus is on trichilemmal keratinization in the tumor (black arrow) (d).