Figure 1

(A) Preoperative CT image of an 81-year-old male patient with maxillary sarcoma showed the tumor invaded the surrounding tissues. (B) Preoperative biopsy pathological pictures suggesting the undifferentiated sarcoma (or malignant fibrous histiocytoma). (C) In interventional surgery, the template-assisted CT-guided needle insertion image showed that the needle insertion angle and depth were good, and the large blood vessels were successfully avoided. (D): Re-examination at 3 days after intervention, CT showed uniform particle distribution in the lesion area. (E) CT image at 6 months after seed implantation showed that the lesion was significantly reduced, and a small amount of residual lesions could be observed on the edge. (F) At 1 year after intervention, CT image showed that the lesion disappeared completely, the boundary was clear, and the implanted particles gathered locally.