Investigation of the frequency of superior semicircular canal dehiscence in patients with otosclerosis

Abstract

Abstract Purpose: To investigate the frequency of superior semicircular canal dehiscence (SSCD) in patients with signs of otosclerosis on temporal bone computed tomography (CT). Materials and Methods: 86 temporal bone CT images of 43 patients (22 men, 21 women; mean age,44 ±11 years; distribution, 20-71 years) with otosclerosis were retrospectively evaluated in Temporal bone CT. In these CT images, the frequency of fenestral / retrofenestral type otosclerosis findings and superior semicircular canal dehissance were compared with age and types of hearing loss . Results: Fenestral type (n:73, 84.8%) and retrofenestral type (n:7, 8.1%) otosclerosis were detected in 80 temporal bones. SSCD was found in 11 (12.7%) of 86 temporal bones. SSCD was detected in 11 temporal bones with signs of Fenestral type otosclerosis (p=0.203). There were no statistically significant differences between SSCD and patients with retrofenestral type otosclerosis(p=0.588). 86 temporal bones were evaluated, the frequency of superior semicircular canal dehissance was significantly higher in the 20-40 age group than in the 40-year-old group (p=0.001). Conclusion: In this study, the frequency of SSCD in otosclerosis was found to be 12.7% and knowing the frequency of association increases the importance of pre-operative high-resolution temporal bone CT, especially in patients who will be operated due to otosclerosis.

Keywords

• Otosclerosis
• Superior semicircular canal dehiscence
• Computed tomography
• Hearing loss

Otosklerozlu hastalarda süperior semisirküler kanal dehissansının sıklığının araştırılması

Öz

Amaç: Temporal kemik Bilgisayarlı Tomografi‘de (BT) otoskleroz bulguları olan hastalarda süperior semisirküler kanal dehissansı(SSKD) sıklığını araştırmaktır. Yöntem: Temporal kemik BT’de otoskleroz bulgusu olan 43 (22 erkek, 21 kadın; ortalama yaş,44 ±11 yıl; dağılım, 20-71 yıl) hastanın 86 temporal kemik BT görüntüsü retrospektif olarak değerlendirildi. Bu BT görüntülerinde fenestral / retrofenestral tip otoskleroz bulgularının ve süperior semisirküler kanal dehissansının sıklıkları, yaş ve işitme kaybı tipleri ile karşılaştırılarak değerlendirildi . Bulgular: 80 temporal kemikte fenestral tip (n:73, %84,8) ve retrofenestral tip (n:7, %8,1) otoskleroz tespit edildi. 86 temporal kemiğin 11‘inde (%12,7) SSKD bulundu. Fenestral tip otoskleroz bulgusu tespit edilen 11 temporal kemikte eş zamanlı SSKD izlendi (p=0.203). Retrofenestral tip otoskleroza sahip hastalar ile SSKD arasında istatistiksel olarak anlamlı farklılık saptanmadı(p=0.588). 86 temporal kemikte 20-40 yaş grupta, 40 yaş üstü gruba göre SSKD sıklığı anlamlı olarak fazla bulundu (p=0,001). Sonuç: Bu çalışmada otosklerozda SSKD sıklığı %12,7 bulunmuş olup birlikteliğin sıklığının bilinmesi, otoskleroz nedeniyle opere olacak hastalarda yüksek çözünürlüklü temporal kemik BT’nin önemini arttırmaktadır.

Anahtar Kelimeler

• Otoskleroz
• Süperior semisirküler kanal dehissansı
• Bilgisayarlı tomografi
• İşitme kaybı

Kaynakça

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