Maxillary osteonecrosis associated to biphosphonate use is an entity found in the mandible in 78% of all described cases. The present article presents the case of a female patient with breast cancer with bone metastasis, afflicted with maxillary osteonecrosis with sinus invasion. Routine imaging studies revealed a lesion in the right maxillary sinus which confirmed clinical suspicion. Lesion was surgically approached and removed with infrastructure hemimaxilectomy; oral-antral communication persistence was rehabilitated with a maxillary shutter. This allowed suitable control of the lesion and avoided its progression