Travmatik optik kanal yaralanması

Özet

Künt kraniyofasiyal travma sonrası görme kaybı veya afferent pupilla kusuru olan hastada optik kanal kırığı, optik sinir sıkışmasıyla birlikte bulunabilir. İnce kesit kontrastsız BT kemik penceresinde kanal duvarındaki kırığı ve kanala uzanan kemik fragmanını gösterir; sinirin işlevsel hasarını BT tek başına dışlayamaz. Bulguların saptanması yaralanmanın anatomik düzeyini ve eşlik eden kafa tabanı travmasını ortaya koyar. Kanal içi bası veya eşlik eden hematom gözden kaçarsa görmeyi tehdit eden lezyonun ciddiyeti eksik raporlanabilir.

Faz ve pencere

Kontrastsız tanısal

Optik kanal korteksinde keskin kesinti, kanal lümenine uzanan kemik fragmanı ve komşu sfenoid/ön kafa tabanı kırığı aranır; kanal içi veya orbital apeks hematomu yumuşak doku dansitesinde olabilir. Optik kanalın kemik yapısı kontrastsız BT'de değerlendirilebilir.

Kemik algoritması tanısal

İnce kesit kemik rekonstrüksiyonlarında optik kanalın tüm çevresinde kortikal süreklilik, kanal çapındaki asimetri ve fragmanın optik sinir hattına yönelimi değerlendirilir.

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

BT bulguları

• Optik kanal korteksinde lineer kırık izlenir; kırık hattı sfenoid kemik yapısına veya komşu kafa tabanı bölgelerine uzanabilir.
• İntrakonal kemik fragmanı — kanal lümenine doğru yer değiştirmiş, optik sinir güzergâhına temas edebilen kemik parçası.
• Kanal kalibresinde daralma — kırık kenarlarının içe basısı veya fragman nedeniyle lümenin asimetrik küçülmesi.
• Orbital apeks hematomu — posterior intrakonal alanda sinir ve çevre yağ planlarını silen sınırlı yumuşak doku yoğunluğu.
• Optik sinir kılıfı çevresinde kan — sinir çevresindeki normal yağ halkasının kaybolması ve kılıf komşuluğunda yoğunlaşma.
• Kanal kırığının komşu sfenoidal yapılar (örneğin çatı, üst kenar veya foramen rotundum) ve kafa tabanı ile ilişkili olması.
• Pnömosefali veya intrakraniyal kanama — komşu kafa tabanı hasarını ve travmanın kapsamını gösteren eşlikçi bulgular.

Normalde

BT'de optik kanal kırığı ve kırık fragmanının optik sinire basısı değerlendirilebilir. Karşı tarafla eş düzeyde incelemede kanal duvarı süreksizliği, lümen çapı asimetrisi ve sinir çevresi yumuşak doku yoğunluk değişimleri değerlendirilir.

Ayırıcı tanı

İzole indirekt travmatik optik nöropati

klinik görme kusuru bulunabilir; BT'de kanal kırığı veya belirgin sinir basısı görülmeyebilir.

Optik sinir kılıfı hematomu

kanal kırığı olmadan sinir kılıfı çevresinde yumuşak doku yoğunluğu ve sinir çevresinde silinme yapar.

Orbital apeks kontüzyonu

apeks yağında düzensiz bulanıklık vardır, ancak kanal korteksinde kesinti şart değildir.

Sfenoid sinüs duvarı kırığı

sinüs çevresinde kırık izlenir; optik kanal korteksinin tutulumu ayrıca gösterilmelidir.

Tuzaklar

• Normal BT, indirekt travmatik optik nöropatiyi dışlamaz; mikrovasküler ve aksonal hasar BT çözünürlüğünün altında kalabilir.
• İnce kesitli BT ve çok düzlamlı yeniden yapılandırmalar (MPR), optik kanal ve komşu yapıların detaylı değerlendirilmesinde kullanılır.
• Kanal komşuluğundaki sfenoid kırığını optik kanal içine uzanmış kabul etmeyin; kanal korteksini aksiyel ve koronal planda ayrı izleyin.

Kendini dene

1. Yüz travması sonrası görme azalmış. İnce kesit BT'de kanal korteksi kesintili ve fragman lümene uzanıyor. En olası bulgu nedir?

   • Optik kanal kırığı
   • Lamina papyracea kırığı
   • Orbital taban kırığı
   • Sfenoid sinüzit
   Cevabı göster

   Optik kanal kırığı. Kanal korteksindeki kesinti ve lümene uzanan fragman doğrudan optik kanal yaralanmasını gösterir. Diğer seçenekler farklı orbital duvar veya sinüs bölgelerindedir ve kanal lümenini bozmaz.

2. Travma sonrası akut görme kaybı ve mutlak afferent pupilla defekti (RAPD) gelişmiş; orbita ve kafa içi ince kesit BT normal bulunmuş. En uygun yaklaşım nedir?

   • Doğrudan travmatik optik nöropati tanısı konulur
   • İndirekt travmatik optik nöropati düşünülmeli ve yakın klinik/radyolojik takip planlanır
   • Acil optik kanal dekompresyonu endikedir
   • Orbital apse nedeniyle acil drenaj yapılır
   Cevabı göster

   İndirekt travmatik optik nöropati düşünülmeli ve yakın klinik/radyolojik takip planlanır. İndirekt travmatik optik nöropati (İTON), mekanik kopma veya kanal kırığı olmadan, iletilen kuvvetlere bağlı iskemi/strese bağlı gelişir ve akut BT'de yapısını bozan bir lezyon göstermeyebilir [S3, S7]. Optik sinirde görünür anatomik bozulma olmadan İTON gelişebileceğinden BT'de yapısal bozulma görülmemesi bu olasılığı dışlamaz; gözlem seçilirse seri klinik ve elektrofizyolojik izlem yapılmalı, görme kötüleşirse acil tekrar BT veya MR değerlendirilmelidir.

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 11 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez. İçerik yapay zekâ destekli bir süreçle güncel literatüre göre cümle cümle kaynaklarla karşılaştırıldı, ancak uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.