Induction chemotherapy with docetaxel, cisplatin and fluorouracil followed by concurrent chemoradiotherapy for unresectable sinonasal undifferentiated carcinoma: Two cases of report

Figure 1 Imaging features in case 1. A: Magnetic resonance imaging (MRI) of the head on admission. The tumor had widely invaded the paranasal sinuses, the right orbit and the cranial base; B: MRI after concurrent chemoradiotherapy showed a complete response of the tumor.

Figure 2 Imaging features in case 2. A: On admission, the tumor involved the paranasal sinuses and the cranial base; B: After the treatment, a complete response of the disease was observed by magnetic resonance imaging.

Figure 3 Pathological findings in case 1. A: Pleomorphic tumor cells with hyperchromatic nuclei, clear cytoplasm and poorly-defined cell borders were seen (hematoxylin and eosin, × 400); B: Immunohistochemically, the tumor cells were positive for AE1/3; C: The tumor cells were negative for p40; D: A high expression of Ki67 was also noted.