Aterom plağı ve trombüsün flep taklidi BT bulguları

Özet

Aterosklerotik plak ve mural trombüs, aort lümenine uzanan düzensiz dolum defektiyle diseksiyon flebi izlenimi verebilir. Ateroskleroz aortada sık görülür; plağın kalsifikasyonu ve duvarla geniş tabanlı ilişkisi, diseksiyondan ayırılmasında yardımcı olabilir. BTA’da damar duvarına bağlılığın ve farklı düzlemlerde devamlılığın incelenmesi temel ayırıcı adımdır; kontrastsız görüntü kalsifiye plağı görünür kılabilir. Yanlış flep tanısı akut diseksiyon yönetimini tetikleyebilir, gerçek diseksiyonun plak sayılması ise tehlikeli tanı gecikmesine neden olur.

Faz ve pencere

Kontrastsız: BT, mural trombozu ve kalsifikasyonları gösterebilir.
BTA tanısal: BTA’da mural trombüs veya kalsifiye aterom diseksiyonla karışabilir; ince aksiyel kesitler bu ayırıcı tanıda önemlidir.

Önerilen pencereler: Anjiyo (G 600 / M 150), Mediasten (G 350 / M 50).

BT bulguları

Eksantrik dolum defekti — yumuşak doku materyali lümenin bir kenarında yer alır ve karşı tarafta kontrastlı kanal kalır.
Geniş duvar tabanı — plak veya trombüs aort duvarına yapışık görünür; gerçek flep gibi serbest ince membran oluşturmaz.
Aterom kalsifikasyonu — kontrastsız görüntüde duvar boyunca uzanan kalsifiye plak, BTA’da lümen içine çıkıntı yapabilir.
Düzensiz iç kontur — aterosklerotik duvar keskin, pürüzsüz bir intimomedial flep yerine düzensiz yüzey gösterir.
İnen aortada yaygın aterom — birden fazla plak veya duvar kalsifikasyonu aynı segmentte eşlik edebilir.
Seyir ve duvar ilişkisi — mural trombüs çoğunlukla duvar boyunca düzensiz, spiral olmayan materyal görünümündedir; diseksiyon lehine intimomedial flep ve spiral seyir aranır.

Normalde

Torasik aortada yaygın ve belirgin ateromatoz hastalık görülebilir. İnen aortanın aynı düzeyinde duvar kalsifikasyonunu, defektin lümene göre eksantrik konumunu ve lezyonun geniş tabanla duvara tutunmasını karşılaştırın.

Normal BT ile kıyasla

Aynı bölgenin, kaynak veri setinde patoloji içermediği belirtilen bir BT incelemesini kesit kesit kaydırın; organ sınırlarını açarak anatomiyi hasta görüntüsüyle karşılaştırın. Küçük rastlantısal bulgular tümüyle dışlanmamıştır.

Kaynak: TotalSegmentator v2.01 veri seti (Wasserthal ve ark., Radiology: Artificial Intelligence 2023), CC BY 4.0, vaka s0115; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Klasik diseksiyonda intimomedial flep gerçek ve yalancı lümeni ayırır; flebin uzanımı kesitler ve MPR’de izlenebilir. Diseksiyonda intimomedial flep gerçek ve yalancı lümeni ayırır; yalancı lümen kısmen tromboze olabilir.
Penetran aterosklerotik ülser: kontrastlı lümenden aterosklerotik duvar içine doğru fokal krater benzeri çıkıntı gösterir.
İntramural hematom: kontrastsız seride duvar içinde hilal biçimli hiperdens kalınlaşmadır; lümen içine uzanan plak benzeri materyal değildir.
Akım-karışım artefaktı: erken BTA’da farklı atenüasyon tabakası duvara sabitlenmeden akım boyunca uzanabilir ve geç görüntüde azalabilir.
Aort intimal sarkomu: lümen yüzeyinden kaynaklanan kitle şeklinde yumuşak doku defekti oluşturabilir; morfoloji ve klinik bağlamla ateromdan ayrılır.

Tuzaklar

Kontrastlı seride kalsifikasyonun lümen sınırındaki konumu yanıltıcı olabilir; kontrastsız seride aynı kalsifikasyonu bulun ve ince kesit MPR’de duvarla ilişkisini doğrulayın.
Mural trombüsü flep diye adlandırmadan önce serbest ince membran ile geniş tabanlı eksantrik duvar materyalini ayırın.
Ülserleşmiş plak basit aterom değildir; kontrastın plak içine krater biçiminde uzanıp uzanmadığını ayrıca inceleyin.

Kendini dene

S1 kaynağında diseksiyonla karışabilecek tanılar arasında hangileri birlikte sayılıyor?
Cevabı göster
Mural trombüs, kalsifiye aterom ve tromboze anevrizma. Kaynak, diseksiyonla karışabilecek örnekler olarak mural trombüs, kalsifiye aterom ve tromboze anevrizmayı birlikte sayıyor.
Aortada penetran aterosklerotik ülser (PAU) kaynakta nasıl tanımlanıyor?
Cevabı göster
Aterosklerotik lezyonda aort intima ve mediasının ülserasyonu. PAU, aterosklerotik lezyonla birlikte aort intima ve mediasının ülserasyonu olarak tanımlanır.

İlgili konular

Kaynaklar

Bu sayfadaki 33 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 6 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.