Ön dolaşım büyük damar oklüzyonu

Özet

Ön dolaşım büyük damar oklüzyonu, akut fokal defisitin intrakraniyal ICA veya MCA ana dallarındaki tıkanıklıkla ilişkili olduğu acil bir damar bulgusudur. BT anjiyografi oklüzyon seviyesini ve kollateral dolumu değerlendirmeyi sağlar; kontrastsız BT ise erken iskemi değişikliklerini ve hemorrhagic risk açısından ASPECTS skorlamasıyla iskemi yükünü belirlemeye yardımcı olur. CTA'da tıkanıklığın kaçırılması damar görüntülemesine dayalı klinik triyajın yanlış kurulmasına neden olabilir. Damarın kesilme noktası ile distal kollaterallerin tarif edilmesi incelemeyi uygulanabilir kılar.

Faz ve pencere

BTA tanısal

İntrakraniyal ICA terminusunda, M1'de veya M2 dallarında kontrast kolonunun ani sonlanması, intraluminal dolum defekti ve distal arterlerin azalmış ya da gecikmiş opasifikasyonu aranır. İnce kesit kaynak görüntüler, multiplanar reformasyonlar ve MIP birlikte incelenir.

Kontrastsız

Kanama dışlanır; hiperdens arter ve erken parankimal değişiklikler oklüzyon tarafını destekleyebilir ancak lümen açıklığını doğrudan göstermez. Bu konu için kontrastlı BTA'nın yerini tutmaz.

Önerilen pencereler: Anjiyo (G 600 / M 150), İnme (G 40 / M 40).

BT bulguları

• ICA terminus oklüzyonunda tıkanıklık intrakraniyal ICA terminalini tutabilir ve M1 segmentinin başlangıcına uzanabilir.
• M1 dolum kesilmesi — MCA ana gövdesinde ani kontrast sonlanması izlenir; distal dallar az dolar veya kollateral yoldan geç dolar.
• M2 dal oklüzyonu — Sylvian fissür içindeki bir veya daha fazla dalın kontrast kolonu kesilir; segment ve dal sayısı tarif edilir.
• İntraluminal dolum defekti — kontrastla çevrelenen veya lümeni daraltan pıhtı, kaynak görüntülerde seçilebilir.
• Distal yeniden dolum — oklüzyonun ötesindeki dalların leptomeningeal kollateraller üzerinden geç opasifikasyonu görülebilir.
• Etkilenen hemisferdeki Sylvian dallarının sayısı ve opasifikasyonu karşı tarafa kıyaslanarak damar ağacı durumu ve kollateral dolum değerlendirilebilir.
• Tandem lezyon — servikal ICA hastalığı ile intrakraniyal ICA/MCA oklüzyonu aynı incelemede birlikte görülebilir.

Normalde

Normal CTA'da kavernöz ve supraklinoid ICA'dan terminal dallara kadar kontrast kolonu kesintisizdir; M1'den çıkan Sylvian dalları iki hemisferde benzer biçimde dolar. Aynı anatomik seviyede karşı tarafı izleyerek lümen sonlanmasını, distal dal opasifikasyonunu ve damar kalibresini kıyaslayın.

Ayırıcı tanı

Zamanlama farklılıkları nedeniyle damar geç fazda dolabilir; tek bir erken görüntüdeki opasifikasyon azlığı gerçek kesilmeden ziyade bolus dinamiği farkı olabilir.

Kronik intrakraniyal stenoz

dar segmentten sonra damar devamlılığı ve kollateral yeniden yapılanma olabilir; ani embolik kesilme görünümünden ayrılır.

Konjenital hipoplazi

damar baştan itibaren ince kalibrelidir ve distal seyri boyunca küçüktür; fokal uçta ani kesilme beklenmez.

Hareket veya kemik artefaktı

kafa tabanı komşuluğunda yalancı lümen kesintisi oluşturabilir; kaynak görüntülerde diğer düzlemlerde kontrol edilir.

Damar diseksiyonu

eksantrik daralma, duvar düzensizliği veya uzun segment incelme görülebilir; tromboembolik ani kesilmeden farklı morfoloji taşır.

Tuzaklar

• MIP görüntüsünde küçük dalın örtüşme nedeniyle kaybolması oklüzyon gibi görünebilir; kesitsel kaynak görüntülere geri dönün.
• Bolus takip ayarları yetersiz olduğunda intrakraniyal damar opasifikasyonu zayıf olabilir; proksimal damar ve aort arkı doluluk düzeyini kontrol edin.
• CTA'da distal yeniden dolum ana damarın açık olduğu anlamına gelmez; kesilme düzeyini ve kollateral ile dolan segmentleri ayrı tarif edin.
• Yüksek dereceli intrakraniyal daralma veya hareket/kemik artefaktları oklüzyon taklit edebilir; karşı taraf anatomisi ve teknik kalite ile birlikte değerlendirilmelidir.

Kendini dene

1. CTA tabanlı otomatik LVO tespit araçlarında yanlış pozitif (yanlış oklüzyon alarmı) bulgunun en yaygın nedeni nedir?

   • Yüksek dereceli intrakraniyal arter daralmasının oklüzyonu taklit etmesi
   • Tamamlanmış leptomeningeal kollateral akım
   • Kafa kemiği artefaktları
   • Venöz fazda görüntüleme
   Cevabı göster

   Yüksek dereceli intrakraniyal arter daralmasının oklüzyonu taklit etmesi. S28 çalışmasına göre, RAPID CTA ve JLK LVO gibi yapay zeka araçlarında yanlış pozitif sonuçların en sık nedeni, yüksek dereceli intrakraniyal darlamanın oklüzyonu taklit etmesidir.

2. CTA tabanlı otomatik LVO tespit araçlarında yanlış pozitif (yanlış oklüzyon alarmı) bulgunun en yaygın nedeni nedir?

   • Yüksek dereceli intrakraniyal arter darılması
   • Tamamlanmış leptomeningeal kollateral akım
   • Kafa kemiği artefaktları
   • Venöz fazda görüntüleme
   Cevabı göster

   Yüksek dereceli intrakraniyal arter darılması. S28 çalışmasına göre, RAPID CTA ve JLK LVO gibi yapay zeka araçlarında yanlış pozitif sonuçların en sık nedeni, yüksek dereceli intrakraniyal darlamanın oklüzyonu taklit etmesidir.

Bu konunun yer aldığı turlar

• Acil BT'de kaçırılmaması gereken bulgular
• İnme BT'si: erken iskemi, damar ve taklitçiler

İlgili konular

• MCA alanı infarktı
• BT perfüzyon: temel haritalar
• Geniş hemisferik infarkt ve ödem

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 8 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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