Case Report

Giant Protruding High-Grade Undifferentiated Pleomorphic Sarcoma Arising in a Keloid Scar on the Abdominal Wall

Figure 3

(a) Gross view of the resected tumor. The tumor is observed to be continuous to the keloid and measures approximately 6.2 × 6 × 3.2 cm. (b) Histopathological examination following hematoxylin and eosin (HE) staining revealing short pleomorphic spindle cells and polygonal cells with a storiform pattern, accompanied by abundant mitotic activity, suggesting undifferentiated pleomorphic sarcoma. The tumor is negative for cytokeratin AE1/AE3 (c) and CAM5.2 (d) on immunohistochemical staining.
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