Orta kafa tabanı kırığı

Özet

Yüksek enerjili künt kafa travmasında sfenoid kemik, sfenoid sinüs çevresi ve petröz kafa tabanından geçen kırıklar; damar, kraniyal sinir ve dura komşuluğundaki yaralanmaları haber verebilir. İlk inceleme kontrastsız ince kesit kafa BT'dir; kemik algoritması kırık hattını, beyin penceresi ise hemorajik sinüs içeriğini, pnömosefaliyi ve eşlik eden kanamayı gösterir. Orta kafa tabanı kırıklarında karotid kanal, kavernöz sinüs ve optik kanal tutulumu değerlendirilmeli; BT anjiyografi vasküler yaralanma tanısında birincil yöntemdir. Bu uzanımlar atlanırsa diseksiyon, psödoanevrizma, karotid-kavernöz fistül, görme kaybı veya BOS kaçağına yol açabilecek yaralanmalar fark edilmeyebilir.

Faz ve pencere

Kontrastsız tanısal

İnce kesit kemik algoritmalı BT'de sfenoid sinüs duvarı, basisfenoid, klivus, pterigoid çıkıntılar ve petröz temporal kemik boyunca kortikal kesinti, çizgisel açıklık veya yer değiştirmiş fragman aranır. Sinüs içinde kanla uyumlu yüksek dansiteli sıvı, kafa içinde hava ve eşlik eden akut kanama yumuşak doku/beyin pencerelerinde incelenir; kırık tanısı için kontrast gerekmez.

BTA

Kırık karotid kanalına ya da internal karotid arterin kavernöz segment komşuluğuna uzanmışsa BTA'da lümen daralması, intimal düzensizlik/flep, oklüzyon, psödoanevrizma veya kavernöz sinüste erken venöz dolum araştırılır. BTA kemik kırığını dışlamak ya da sınıflamak için kullanılan temel seri değildir.

Önerilen pencereler: Kemik (G 1800 / M 400), Beyin (G 80 / M 40), Yumuşak doku (G 400 / M 40), Anjiyo (G 600 / M 150).

BT bulguları

• Sfenoid sinüs duvarı kırığı — sinüsün ön, arka, lateral veya üst duvarında keskin kortikal basamaklanma ya da devamlılık kaybı.
• Basisfenoid veya klivus çatlağı — orta hatta uzanan çizgi sella tabanını, klivusu ya da karşı kafa tabanı yapılarını kesebilir.
• Karotid kanal tutulumu — kırık hattı petroz kanalın kemik halkasına ulaşır; bu bulgu tek başına arter lümen yaralanması demek değildir.
• Travmada sfenoid sinüs duvarı kırığı görülebilir.
• Pnömosefali — kırık hattıyla komşu bazal sisternlerde, ekstraaksiyel aralıkta veya intraventriküler alanda hava odakları.
• Kafa içi eşlikçi yaralanma — temporal kontüzyon, ekstraaksiyel hematom veya subaraknoid kanama kırıkla aynı travma incelemesinde aranır.

Normalde

Kırık şüphesinde karşı sfenoid sinüs duvarı ve ardışık aksiyel-koronal-sagittal kesitler kıyaslanarak gerçek kesinti, yer değiştirme ve kanal uzanımı ayrılır; yalnız tek kesitteki çizgisel lucensi kırık sayılmaz.

Ayırıcı tanı

Normal sfenoid sinüs septumu

sinüs içinde orta hatta uzanır ve dış kortekste travmatik basamak oluşturmaz.

Klivus gelişimsel kanal veya sinkondroz

düzgün sınırlı, beklenen anatomik hatta ve karşı tarafla uyumlu görünür.

Tuzaklar

• Sfenoid sinüsteki sıvı seviyesini kırık hattı sanmayın; tanı için duvar korteksindeki gerçek kesintiyi çok düzlemli kemik rekonstrüksiyonunda gösterin.
• Karotid kanal kırığı tek başına arter yaralanmasını garanti etmez; damar içi lezyonun doğrulanması için BT anjiyografi gereklidir.
• Yoğun bazal kemik artefaktı küçük kırık çizgisini gizleyebilir; sfenoid sinüs duvarlarını koronal ve sagittal reformasyonlarda yeniden izleyin.
• Sella ve kavernöz sinüs çevresindeki kırıklarda göz küresi/optik kanal ve karşı kafa tabanı uzanımını yalnız ilk belirgin çizgide bırakmayın.

Kendini dene

1. Travma BT'sinde sfenoid sinüs duvarından karotid kanal korteksine uzanan keskin çizgi var. Arter lümeninde diseksiyon olup olmadığını hangi inceleme gösterir?

   • BT anjiyografi
   • Kontrastsız beyin BT
   • Temporal kemik HRCT
   • BT venografi
   Cevabı göster

   BT anjiyografi. BT anjiyografi internal karotid arter lümenindeki flep, daralma veya psödoanevrizmayı gösterebilir. İlk travma görüntülemesinde kontrastsız kafa BT'si kullanılır.

2. Skull base travmasında internal karotid arter yaralanması (BCVI) şüphesi durumunda ilk tercih edilen görüntüleme yöntemi hangisidir?

   • Kontrastsız beyin BT
   • BT anjiyografi (CTA)
   • Manyetik rezonans anjiyografi (MRA)
   • Duplex ultrasonografi
   Cevabı göster

   BT anjiyografi (CTA). Kaynaklar, hızlı elde edilebilmesi ve yüksek tanısal doğruluğu nedeniyle BT anjiyografisinin (CTA) BCVI taraması ve tanısında birincil yöntem olduğunu belirtir.

İlgili konular

• Temporal kemik travmasında karotid kanal yaralanması
• Temporal kemik kırığı

Kaynaklar

Bu sayfadaki 32 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 3 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez, tıbbi tavsiye değildir. Metinler yapay zekâ desteğiyle yazıldı ve otomatik bir adımda kaynak alıntılarıyla karşılaştırıldı; bu bir tıbbi doğrulama değildir ve içerik uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.