Fig. 1The trichilemmal carcinoma is composed of several epithelial aggregations arranged in various growth patterns, including solid, lobular and trabecular growth patterns (skin, H&E, ×40).
Fig. 2The epithelial aggregation exhibits, at least focally, the feature of outer root sheath differentiation, including neoplastic cells with abundant, clear cytoplasm, and the cells show prominent atypia and a high mitotic activity (skin, H&E, ×400).
Fig. 3The metastatic lymph node demonstrates neoplastic cells with prominent atypia (lymph node, H&E, ×40).
Fig. 4The initial abdomino-pelvic CT scan demonstrates multiple, various sized, enlarged lymph nodes in the aortocaval, paraaortic, portocaval (A) and left inguinal areas (B).
Fig. 5The follow-up CT scan after four cycles of chemotherapy shows the decreased size of retroperitoneal (A) and left inginal lymph nodes (B).