Background: Frontal sinuses are 2 irregular cavities, placed between 2 lamina of frontal bone. Expansion continues during childhood and reaches full size after puberty. Persistent metopic suture is one of the factors that are related to abnormal frontal sinus development. In this study, we want to discuss about the coexistence of persistent metopic suture and abnormal frontal sinus development using radiological techniques. Materials and methods: In this retrospectively planned study, images of 631 patients were examined, 217 (34.4%) of them were men and 414 (65.6%) of them were women. Brain computed tomography and magnetic resonance images were retrieved from the electronic archive for analysis. Results: In this study, frontal sinus development is categorised as right side atrophy, left side atrophy, bilateral atrophy and bilaterally developed sinuses. The presence of metopic suture was accepted as persistent metopic suture. Frontal sinus atrophy was found in 22.7% and persistent metopic sutures were found in 9.7% of overall. Conclusions: In this study, no significant results were detected that were related to the frontal sinus agenesis or dismorphism associated with persistent metopic suture. We conclude that, although publications propounding metopism that leads to abnormal frontal sinus development are present in the literature, no reasonable explanation has been mentioned in these articles; and we believe that these findings are all incidental. (Folia Morphol 2013; 72, 4: 306–310)
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