PMC6537059_01
Violaceous exophytic mass arising within the surgical wound.
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The tumor proved to be highly aggressive as within 2  months a new violaceous necrotic mass had rapidly emerged within the surgical wound (Figure 1).
Surgical resection extending to the level of the deep fascia.
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This time, an extensive surgical resection extending to the deep fascia was performed (Figure 2).
Sheets of poorly differentiated pleomorphic neoplastic cells invading the
dermis, with numerous mitoses (hematoxylin and eosin, original magnification
x 40).
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Indeed, microscopy now showed an infiltrating poorly differentiated SCC composed of islands of atypical sarcomatoid spindle cells (Figure 3), staining positive for CK5/6, CKAE1/AE3, p63, and vimentin.