Abdominal aort ve visseral ostium aterosklerozu

Özet

Abdominal aort aterosklerozu çoğu kez duvar kalsifikasyonu ve plakla görünür; çölyak, SMA veya renal arter ostiumuna uzanan plak ise ilgili organ akımını azaltabilir. Arteriyel BT anjiyografi ostial darlığın yerini, derecesini, plak morfolojisini ve distal damar yatağını birlikte gösterir; bağırsak duvarı değerlendirmesi için portal venöz seri tamamlayıcıdır. Aortik plak yüzeyi ülserleşebilir veya üzerinde trombüs bulunabilir; distal dal oklüzyonu embolik organ hasarıyla sonuçlanabilir. Ostial hastalığın ya da distal iskemi bulgularının atlanması, acil mezenterik iskemi ve renovasküler hastalık değerlendirmesini geciktirebilir.

Faz ve pencere

Kontrastsız

Mezenterik iskemi BT protokolünde kontrastsız seri kullanıldığında kalsifiye plak gösterilebilir; ancak bu serinin protokolden çıkarılabileceği de bildirilmiştir.

BTA tanısal

Arteriyel fazda çölyak arter ve SMA’nın proksimal kesimlerindeki kalsifiye veya kalsifiye olmayan plaklara bağlı darlık ve oklüzyon değerlendirilir. Akut emboliler genellikle SMA’nın orta kolik arter çıkışının distalindeki proksimal bölümüne yerleşir; aterosklerotik tromboz ise çoğunlukla mezenterik arter ostiumunda veya yakınında gelişir.

Portal

Bağırsak anslarında duvar kalınlığı ve kontrastlanma, mezenterik ödem, serbest sıvı veya ileri iskemiye ait pnömatozis ve portal venöz gaz değerlendirilir; bu seri ostial plak derecesinin yerine geçmez.

Önerilen pencereler: Anjiyo (G 600 / M 150), Batın (G 400 / M 50), Yumuşak doku (G 400 / M 40).

BT bulguları

• Aort duvarında çizgisel veya plak biçimli kalsifikasyonlar, yaygın ateroskleroz dağılımını gösterir.
• Yumuşak plak aort lümenine eksantrik uzanabilir; kalsifiye ve yumuşak bileşenler aynı lezyonda birlikte bulunabilir.
• Çölyak arter ve SMA’nın proksimalinde plakla ilişkili darlık veya tıkanıklık, kronik mezenterik iskemiyle uyumlu olabilir.
• Abdominal aort aterosklerozuna renal arterlerdeki plaklar da eşlik edebilir; renal arterlerde bilateral veya unilateral kalsifiye plaklar görülebilir.
• Aort plağındaki penetran aterosklerotik ülser, akut aort sendromu spektrumundadır; altta yatan aortada aterosklerotik değişiklikler veya anevrizmal genişleme bulunabilir.
• Aortik trombüsler distal sistemik emboliye ve visseral iskemiye yol açabilir; eşlik eden ateroskleroz da değerlendirilmelidir.
• Bağırsak iskemi eşlik ediyorsa azalmış veya heterojen duvar kontrastlanması, dilatasyon, mezenterik ödem ya da geç evrede pnömatozis görülebilir.

Ölçütler ve sınıflamalar

Tek damar kronik mezenterik iskemi şüphesinde klinik açıdan anlamlı darlık

Tek damar hastalığında çölyak arter veya SMA darlığı, uyumlu klinik belirtiler ve mümkünse fonksiyonel değerlendirmeyle birlikte yorumlanır.

Yaygın çok damar hastalığında klinik açıdan anlamlı SMA darlığı

Yaygın çok damar hastalığında SMA darlığı ve klasik klinik belirtiler birlikte kronik mezenterik iskemi tanısını destekler.

Normalde

Çölyak arter ve SMA abdominal aortadan çıkar; BT anjiyografi bu damarların proksimalindeki plak ilişkili darlık veya oklüzyonu gösterebilir. Duvar kalsifikasyonu, ostial lümen kaybı ve distal organ kontrastlanmasını sağ-sol veya proksimal-distal düzlemde kıyasla; yalnız kalsifik plak varlığı semptomatik organ iskemisini kanıtlamaz.

Ayırıcı tanı

Aort diseksiyonu

intimal flep, diseksiyonun yayılımına bağlı olarak damar dallarını etkileyebilir.

Aortik trombüs

özellikle serbest yüzen veya büyük proksimal trombüsler birden fazla damar yatağına emboli kaynağı olabilir; ateroskleroz eşlik edebilir.

Penetran aterosklerotik ülser

yoğun aterom zemininden duvar içine uzanan kontrast dolu kraterdir; basit ostial stenozdan duvar penetrasyonu ile ayrılır.

Median arkuat ligament basısı

çölyak arter proksimalinde dıştan, kancamsı üst yüz çentiği ve ekspiratuvar değişiklik oluşturur; ostial kalsifiye plak paterni beklenmez.

Fibromüsküler displazi

çoğunlukla renal arterin orta-distal kesimlerinde ardışık daralma ve genişleme oluşturur; aortik ostiuma oturan eksantrik plak görünümü tipik değildir.

Vaskülit

damar duvarında daha uzun segmentli, düzgün konsantrik kalınlaşma ve kontrastlanma yapabilir; fokal kalsifiye ostial ateromdan farklıdır.

Tuzaklar

• Kalsiyum blooming artefaktı, damar lümeninin değerlendirilmesini etkileyebilir.
• BT, mezenterik arterlerde yumuşak plak ve kalsifikasyonları gösterebilir; SMA trombozu ateroskleroz zemininde genellikle ostiumda veya yakınında gelişir.
• Belirgin ostial stenozu semptomatik kronik mezenterik iskemiyle eşitleme; çok damar tutulumu, klinik tablo, kollateraller ve bağırsak bulguları birlikte yorumlanmalıdır.
• Plak saptandığında distal emboliyi de araştır; mezenterik emboliler SMA’yı sık etkiler ve dalak veya böbrek gibi diğer visseral organlarda eşzamanlı emboliler bulunabilir.

Kendini dene

1. Akut veya kronik mezenterik iskemi şüphesinde ilk basamak görüntüleme yöntemi hangisidir?

   • BT anjiyografi
   • Konvansiyonel anjiyografi
   • Direkt karın radyografisi
   • Doppler ultrasonografi
   Cevabı göster

   BT anjiyografi. BT anjiyografi akut ve kronik mezenterik iskemi şüphesinde ilk basamak görüntüleme yöntemidir; kronik mezenterik iskemi değerlendirmesinde klinik ve radyolojik bulgular birlikte ele alınır. Konvansiyonel anjiyografi ikinci basamaktadır.

2. S50'ye göre akut aort sendromu spektrumunda yer alan ve altta yatan aortada aterosklerotik değişiklikler veya anevrizmal genişleme bulunan patoloji hangisidir?

   • Penetran aterosklerotik ülser
   • Median arkuat ligament basısı
   • Fibromüsküler displazi
   • Mezenterik ven trombozu
   Cevabı göster

   Penetran aterosklerotik ülser. Penetran aterosklerotik ülser akut aort sendromu spektrumundadır; altta yatan aortada aterosklerotik değişiklikler veya anevrizmal genişleme bulunur.

İlgili konular

• Mezenterik kollateral arkadlar
• Kontrast karışımına bağlı yalancı dolum defekti

Kaynaklar

Bu sayfadaki 39 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 20 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.