A rare case of an extremely large, unilateral incisive canal cyst (nasopalatine duct cyst), located between the teeth #11 and #25 is presented. The upper border of the cyst extended to the nasal cavity, the posterior border was the maxillary sinus while the lower border was 5 mm above the maxillary alveolar process. The apices of the vital teeth 21, 22, 23 were in the cyst. Cystectomy was combined with the implantation of an osteoconductive bone substitute material (beta-tricalcium-phosphate). The origin of the cyst was verified by histological examination. The authors also review the origin and pathology as well as the clinical and radiological symptoms and therapy of the non-odontogenic cysts.
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