Locally Advanced Pleomorphic Dermal Sarcoma of the Forearm.

Pleomorphic dermal sarcoma (PDS) is a rare mesenchymal tissue tumor that shares pathological features with atypical fibroxanthoma, but also exhibits tumor necrosis, invasion beyond the superficial subcutis, and vascular or perineural infiltration. In addition, PDS also has relatively high rates of local recurrence and metastasis and is usually encountered in elderly men, especially in the head and neck area. In this article, we report a rare case of PDS that infiltrated the fascial tissues in the forearm of a female patient. After wide local excision, the defect was covered with an anterolateral thigh free flap and adjuvant radiotherapy was instituted.