Male, 37 years old, left maxillary sinus cancer recurred 4 months after surgery and 3 courses of chemotherapy. Wei Youguo, Minimally Invasive Oncology, Shandong Qianfoshan Hospital, Shandong Province, ChinaParticle implantationPre-operative CT-enhanced coronal positionPre-operative planned route of approachParticle implantationParticle implantationParticle implantationParticle implantationParticle implantationReviewed 2 months after surgerySkeletal sclerosis of the mass areaReviewed 1 year after surgerySkeletal sclerosis of the mass area and CR of lesion