Abstract
Undifferentiated pleomorphic sarcoma (UPS) is a rare soft tissue sarcoma of the sinonasal area. Here, we present two primary cases of UPS and three post-irradiation sinonasal UPS cases. Imaging findings were misinterpreted by radiologists as representing other malignant tumors or recurrence of the primary tumor. Our cases indicate that post-irradiation UPS can originate within any part of the radiation field. Treatment outcomes of primary sinonasal UPS seem to be favorable if the tumor is treated ag-gressively, but the outcomes of post-irradiation sinonasal UPS may be poor if appropriate surgical margins cannot be obtained.
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Fig. 1.
A bulky soft tissue mass in the right maxillary sinus with destruction of the maxillary walls and extension to the buccal space in gadolinium-enhanced T1-weighted MR image of primary UPS.
Fig. 2.
Heterogeneously enhancing large mass with bony destruction of the maxillary walls and nasal cavity in CT scan (A) and MR image (B) of post-irradiated UPS.
Fig. 3.
Histopathology of radiation-induced undifferentiated pleomorphic sarcoma. The tumor consists of mixed spindle cells and roundedcells arranged in a stori-form pattern. A: Hematoxylin-eo-sin (×400). B: Negative staining for cytokeratin by immunohistochemistry (×400).
Table 1.
Clinical features of the current series of undifferentiated pleomorphic sarcoma of the sinonasal tract



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