DOI: https://doi.org/10.36347/sjds.2026.v13i2.001

Pages: 18-22

Background: Dentigerous cysts are the most frequent developmental odontogenic cyst, typically found in relation to unerupted mandibular third molars or maxillary canines and rare in the first decade of life. Ectopic migration of the third molar in the maxillary sinus to the level of orbital floor is an uncommon presentation, particularly in children. Case Presentation: A 10-year-old boy presented to the outpatient department of our institution with a swelling in the right hemiface of one year's duration. Computed tomography (CT) scan demonstrated a well-circumscribed unilocular expansile lesion (3.7 × 2.9 × 2.8 cm) in the right maxillary sinus with displacement of the root of an upper lateral incisor and an ectopic third molar displaced to the orbital floor. Management: Surgical enucleation with widening of the tooth-bone window using a sublabial (Caldwell–Luc) approach including extraction of ectopic and impacted teeth was carried out. Histopathology confirmed a dentigerous cyst. Conclusion: This case illustrates that dentigerous cysts can cause marked tooth displacement in children and underlines the need for precise early diagnosis using CT to avoid orbital and sinus sequelae.