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Three osteomas originating from ipsilateral separating paranasal sinuses. Objective: Osteoma is the common benign tumour in the paranasal sinuses. However, multiple osteomas originating from the separating paranasal sinuses is extremely rare.
Case report: We report on the unusual case of a patient with three osteomas originating from the ipsilateral frontal, ethmoid and maxillary sinuses, which were successfully removed via an endoscopic approach.
Conclusion: Clinicians should be aware of the possibility of Gardner syndrome in patients with multiple paranasal sinus osteomas.