Fig. 6

Enhanced MRI scan of the paranasal sinus (2021-08-20). The tumour had reoccupied the right maxillary sinus and the right common nasal meatus (arrow) (a). Enhanced MRI scan of the neck (2021-08-20). Lymphatic metastasis had occurred in the right neck, and the largest lymph nodes were located in the IB area of the right neck (2.8 cm × 2.0 cm) (arrow) (b). Enhanced MRI scan of the paranasal sinus and neck (2021-12-02). The space-occupying area in the right maxillary sinus had decreased in size, while the IB area of the right neck (2.3 cm × 3.9 cm) was larger than before, with multiple lymph nodes present in the bilateral neck IV region (arrow) (c)