Ulcerating Tumor of the Scalp: Challenge
Skin biopsies of the scalp and glabella were done and demonstrated, respectively: small irregularly shaped islands of basaloid cells surrounded by a thin band of hyaline material and arranged in a “jigsaw” pattern (Fig. 2A); and small basaloid cells with hyperchromatic nuclei and large basaloid cells with a pale nucleus and eosinophilic globules (Fig. 2B). A biopsy of the ulcerating tumor revealed large nodules of pleomorphic cells with increased mitoses and central necrosis (Figs. 3A–C).