Uncommon presentation of a maxillary calcifying epithelial odontogenic tumor invading the sinus: Case report and literature analysis

Background : Calcifying epithelial odontogenic tumor (CEOT), or Pindborg tumor, is a rare benign odontogenic neoplasm accounting for less than 1.6% of odontogenic tumors. It exhibits local invasiveness, polyhedral epithelial cells, amyloid-like deposits, and calcifications. Maxillary involvement with sinus extension is exceptionally rare. Case Presentation: A 31-year-old woman presented with progressive pain and swelling in the right posterior maxilla. Imaging revealed a mixed radiolucent-radiopaque lesion involving the maxillary sinus, lateral nasal wall. Enucleation and curettage were performed through a vestibular degloving incision, with nasal antrostomy. Histopathology demonstrated polyhedral epithelial cells, amyloid-like deposits, and Liesegang ring calcifications. Congo red staining confirmed amyloid deposition. Maxillary CEOT with sinus extension poses diagnostic and surgical challenges. Recurrence rates of 15–30% warrant complete excision and long-term surveillance. Conclusion : Radiographic and histopathological assessment, appropriate surgical management, and prolonged follow-up are essential for favourable outcomes.