The evaluation of paranasal sinuses and anatomical variations with dental volumetric tomography

Year 2011, Volume: 38 Issue: 3 - Volume: 38 Issue: 3, 143 - 152, 01.10.2011

Melda Mısırlıoğlu Rana Nalçacı Mehmet Zahit Adışen Yardımcı Selmi Yılmaz

Abstract

Paranasal sinus region has a very complex and variable anatomy. There are many anatomical variations on sinonasal region and detection of these variations becomes important to avoid complications when endoscopic surgery was planned. Variations of paranasal sinuses includes concha bullosa, septum deviation, agger nasi cell, kuhn cells, haller cell, onodi cell, paradoxical middle concha, unsinate prosess variations and maxillary sinuse hypoplasia. Some of these variations can be detected with plain extraoral radiographs. However plain radiographies is not always sufficient to demonstrate complex anatomy of this area. CT is an excellent means of providing anatomical information of this region and routinely used for pre-operative planning prior to functional endoscopic sinus surgery. On the other hand cone-beam computed tomography CBCT has more advantages than CT with its compact design, short scanning times, low cost and low radiation dose. In this review, we aim to demonstrate the complex anatomy of paranasal sinus area. The wide spectrum of variations affecting paranasal region will be described and illustrated with useful CBCT imaging features

Keywords

Paranasal sinuses, anatomical variations, haller cell, concha bullosa, cone-beam computed tomography

Paranasal sinüs anatomik yapıları ve varyasyonlarının dental volumetrik tomografi ile incelenmesi

Abstract

Paranasal sinüs bölgesinde oldukça kompleks ve değişken yapılar görülür ve bu bölgede bir çok anatomik varyasyon bulunmaktadır. Endoskopik cerrahi planlanan hastalarda olası komplikasyonların önüne geçebilmek için varyasyonlarınönceden tespiti önem taşımaktadır. Paranasal sinüslerde görülen varyasyonlar; konka bülloza, septum deviasyonu, ager nazi hücresi, kuhn hücreleri, haller hücresi, onodi hücresi, paradoksal orta konka, unsinat proses varyasyonları ve maksiller sinüs hipoplazisi’dir. Bu varyasyonların bir kısmı direkt ekstraoral radyograflarla tespit edilebilir. Ancak direkt radyografiler bölgenin kompleks anatomisini göstermekte çoğu zaman yeterli olmamaktadır. Bilgisayarlı tomografi BT ise bölge hakkında detaylı anatomik bilgi sağlayan üstün görüntüleme yöntemlerinden biridir ve fonksiyonel sinüs cerrahisi öncesi planlamada rutin olarak kullanılmaktadır. Diğer taraftan cone-beam bilgisayarlı tomografi CBCT ise kompakt dizaynı, hızlı görüntüleme zamanı, düşük maliyet ve düşük radyasyon dozu yönünden BT’ye üstünlük sağlamaktadır.Bu derlemede paranasal sinüs bölgesinin kompleks anatomisi gösterilirken, bölgeyi etkileyen geniş spektrumdaki anatomik varyasyonlar CBCT görüntüleri kullanılarak değerlendirilecektir

Keywords

Paranasal sinüsler, anatomik varyasyonlar, haller hücresi, konka bülloza, cone-beam bilgisayarlı tomografi

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