A Case of Trichoblastic Fibroma / 대한피부과학회지

ABSTRACT

Trichoblastic fibroma is a rare benign tumor of hair germ with mixed epithelial-mesenchymal components. A 64-year-old female presented with an asymptomatic, skin-colored, firm nodule on the left knee joint. Histopathologic examination showed multiple tumor islands and strands eomposed of basaloids cells embedded in a moderately cellular fibroblastic stroma and the for vation of bud-like extension of tumor cell nest. The peripherel basaloid cells shovred a palisading arrangement and small keratinous cysts were formed in tumor islands.