Disekan psödoanevrizma ve blister anevrizma

Özet

Diseksiyon, intimal yırtıktan giren kanın damar duvarı katmanları arasında ilerlemesiyle lümende stenoz veya çift kanal oluşturabilir; eşlik eden duvar defekti dış konturda psödoanevrizmal keseleşmeye yol açabilir. Blister anevrizma ise çoğunlukla supraklinoid ICA'nın dallanmayan yüzeyinde sığ ve geniş tabanlı çıkıntı biçimindedir. Her iki lezyon küçük ve değişken biçimli olabilir; subaraknoid kanama ya da distal iskemiyle başvurabilir. BT anjiyografi (BTA), intrakraniyal arterlerdeki anevrizma ve damar değişikliklerini tespit etmede güvenilir bir yöntemdir; değerlendirme protokolünde kontrastsız BT bulguları da incelenir. İnce blister odağı veya erken diseksiyon negatif BTA'da gözden kaçabileceğinden kanama paterni damar değerlendirmesinden bağımsız ele alınmamalıdır.

Faz ve pencere

Kontrastsız

Damar duvarı MR görüntüleme, intimal flep ve intramural hematom/trombus tespiti için yüksek çözünürlük sağlar; rutin MR anjiyografide akış sinyalleri nedeniyle hematom tespiti zor olabilir.

BTA tanısal

Damar duvarında uzun segmentli düzensiz daralma, konik stenoz-genişleme geçişi, yalancı lümen şüphesi veya supraklinoid ICA'da dallanmayan yüzeyden çıkan sığ, geniş tabanlı kontrast çıkıntısı aranır.

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

BT bulguları

• Supraklinoid internal karotid arterin dallanmayan yüzeyinde, belirgin boynu olmayan sığ ve geniş tabanlı fokal çıkıntı izlenir.
• Dallanmayan duvar yerleşimi — blister odağı ICA'nın dallanmayan duvar yüzeyine yerleşir; bu özellik nedeniyle konvansiyonel anjiyografide kolayca kaçırılabilir.
• İnce lüminal flep — kaynak BTA görüntülerinde opak lümeni ikiye ayıran ince çizgisel yapı diseksiyon flebini düşündürür.
• Uzun segmentli daralma — arter boyunca düzensiz veya düzgün stenoz, eşlik eden dış çap artışı ile birlikte izlenir.
• Yalancı kese — diseke duvarın dışına uzanan kontrast cebi ana lümenle dar bağlantı gösterebilir.
• SAK veya infarkt — sisternal kanama ya da damar bölgesine uyan parankimal iskemi, ilgili bir komplikasyon olarak raporlanır.

Normalde

Normal supraklinoid ICA duvarı tekdüze ve düzgün konturludur; dallanmayan duvar yüzeyinde fokal çıkıntı veya düzensizlik izlenmez. İntrakraniyal vertebral ve baziler arterleri de kesitler boyunca izleyin; lümen konturunun tekdüze olup olmadığını değerlendirin ve çift kanal veya uzun segmentli stenoz bulunup bulunmadığına bakın.

Ayırıcı tanı

Sakküler anevrizma

genellikle damar dallanma noktalarında oluşur.

İnfundibulum

dallanma noktasındaki çıkıntının morfolojisini ayırıcı tanıda değerlendirin.

Aterosklerotik düzensizlik

kalsifiye veya yumuşak plak duvar boyunca lümeni daraltır; yalancı kese ya da intimal flep oluşturmaz.

Vazospazm

SAK sonrası birden fazla damarda düzgün veya segmental daralma yapabilir; fokal duvar çıkıntısı beklenmez.

Travmatik psödoanevrizma

travma mekanizması ve yaralanma hattı ile uyumlu arter segmentinde dışa keseleşme görülür.

Tuzaklar

• Blister anevrizma, görünmez morfolojisi ve dallanmayan yerleşimi nedeniyle konvansiyonel anjiyografide kolayca gözden kaçabilir; ince kaynak kesitler ve çoklu düzlem rekonstrüksiyonlarla dikkatli tarama gereklidir.
• SAK varken negatif BTA küçük blister lezyonunu dışlamaz; kanama dağılımı ile ICA yüzeyini eşleştirip damar görüntüsündeki teknik sınırlılığı açıkça belirtin.
• Şüpheli intimal flep veya çift kanal izlenimi, komşu damar dallarının üst üste binmesinden kaynaklanan artefakt olabilir; kesin tanı için ortogonal düzlemdeki ince kaynak kesitler veya damar duvarı MR görüntülemesi ile doğrulanmalıdır.
• Blister ve disekte pseödoanevrizmalar akut dönemde hızlı büyüyebilir veya spontan olarak gerileyebilir; bu dinamik yapı nedeniyle önceki incelemelerle karşılaştırma ve yakın takibi zorunlu kılar.

Kendini dene

1. SAK bulunan hastada BTA, supraklinoid ICA'nın dallanmayan yüzeyinde sığ ve geniş tabanlı küçük çıkıntı gösteriyor. En olası lezyon nedir?

   • Blister anevrizma
   • PCom infundibulumu
   • MCA bifurkasyon anevrizması
   • Aterosklerotik plak
   Cevabı göster

   Blister anevrizma. Supraklinoid ICA'nın dallanmayan duvarındaki sığ geniş tabanlı çıkıntı blister anevrizma morfolojisidir. MCA anevrizmaları sık görülen sakküler anevrizma yerleşimlerindendir ve genellikle bifurkasyonda bulunur.

2. Vertebral arter BTA'sında uzun segment düzensiz stenoz, lümen içinde ince çizgisel flep ve distal infarkt görülüyor. En olası süreç nedir?

   • Arter diseksiyonu
   • Vazospazm
   • Fuziform ektazi
   • İnfundibulum
   Cevabı göster

   Arter diseksiyonu. Flep ile uzun segmentli düzensiz stenoz diseksiyon lehinedir; distal infarkt arter kaynaklı iskemiyle uyumludur. İnce intimal flep ve uzun segmentli daralma diseksiyon bulgularıdır; diseksiyonla ilişkili parankimal komplikasyon olarak inme görülebilir.

İlgili konular

• Sakküler intrakraniyal anevrizma

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 19 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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