Nonenfeksiyöz aortit BT bulguları

Özet

Nonenfeksiyöz aort tutulumu, dev hücreli arterit ve Takayasu arteriti gibi büyük damar vaskülitlerinde; IgG4 ilişkili hastalıkta ise aortit veya periaortit biçiminde görülebilir. BT anjiyografi aort duvar kalınlaşması ve kontrastlanmasını, ayrıca lümen stenozunu gösterebilir. Aortanın ve diğer damar yataklarının görüntüleme ile haritalanması, tutulumun yaygınlığını değerlendirmeye yardımcı olur. Aortit, anevrizma, diseksiyon veya rüptür gibi komplikasyonlara yol açabilir.

Faz ve pencere

BTA tanısal: Arteriyel kontrastlı ince kesitlerde aort duvarında düzgün konsantrik veya yamalı asimetrik kalınlaşma, duvar boyunca kontrastlanma ve çevresel yumuşak doku izlenebilir; uzun segment tutulum, dal damar ağızlarında darlık ve anevrizma araştırılır.
Gecikmiş: Geç faz görüntüleme, IgG4 ilişkili aortitte duvarın homojen kontrastlanmasını değerlendirmek amacıyla seçici olarak kullanılabilir.

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

BT bulguları

BT ile görülen duvar kalınlaşması ve kontrastlanma büyük damar vaskülitini düşündürür; hastalık aktivitesi ile sabit yapısal hasar ayrımı zordur.
Mural kontrastlanma — kontrastlı kesitlerde kalınlaşmış duvarın damar lümeninden ayrı seçilen belirgin kontrast tutulumu.
Uzun segment tutulum — çıkan aorta, arkus ve desendan aortanın kesintisiz veya çok odaklı tutulumu hastalık dağılımını belirler.
Dal damar ostiumlarında etkilenme — brakiyosefalik, sol ortak karotis veya sol subklavyen arter çıkışlarında darlık ya da duvar kalınlaşması görülebilir.
Periaortik yumuşak doku — aorta çevresindeki infiltratif doku inflamasyonla ilişkili olabilir; dağılımı duvar bulgusuyla eşleştirilir.
Lümen stenozu veya oklüzyonu — kronik büyük damar vaskülitinde tutulan damar segmentinde lümen daralması ya da tıkanması gelişebilir.
Anevrizmal yeniden şekillenme — inflamasyonun zayıflattığı segmentte dış çap artışı veya fokal sakküler çıkıntı gelişebilir.

Normalde

Aort duvarının çevresel kalınlığını, kontrastlanma simetrisini ve ana dal ostiumlarının açıklığını aynı düzeyde karşılaştırın. Normal karşılaştırmada aort duvarındaki homojen çevresel kalınlaşma aortit lehine bir bulgudur; IgG4 ilişkili aortitte kalınlaşmış duvarda geç fazda homojen kontrastlanma görülebilir.

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

Enfeksiyöz aortit: fokal düzensiz duvar hasarı, periaortik sıvı/gaz veya hızlı gelişen sakküler yalancı anevrizma enfeksiyonu öne çıkarır.
Aort aterosklerozu: genellikle eksantrik, kalsifiye ve plak biçimli intimal düzensizlik yapar; uzun düzgün duvar bandı beklenmez.
İntramural hematom, aort media tabakası içinde kanama ile karakterizedir.
Periaortik fibrozis/IgG4 ilişkili periaortit: dıştan saran yumuşak doku aortayı çevreler ve komşu organları sarabilir; klinik bağlam ve ek organ bulguları önemlidir.
Aort diseksiyonu, aortiti taklit edebilen akut aort patolojileri arasındadır ve BT anjiyografi ile dışlanabilir.

Tuzaklar

BT anjiyografi aort patolojilerinin değerlendirilmesinde kullanılır; tanısal incelemede görüntü kalitesi dikkate alınmalıdır.
Aterosklerotik plakla eşlik eden kalınlaşma vaskülit izlenimi verebilir; plakların eksantrik ve kalsifiye dağılımını duvarın daha düzgün tutulumundan ayırın.
Aortit değerlendirmesinde enfeksiyöz nedenler dışlanmalıdır; BT bulguları tek başına etiyolojiyi belirlemeyebilir.
BT morfolojisi inflamasyonun nedenini tek başına belirlemez; görüntü bulgularını klinik ve laboratuvar verileriyle etiyolojik olarak ilişkilendirin.

Kendini dene

IgG4 ilişkili aortitte kontrastlı BT'de hangi kontrastlanma özelliği bildirilmiştir?
Cevabı göster
Geç fazda homojen kontrastlanma. Kaynakta IgG4 ilişkili aortit lezyonlarının kontrastlı BT'nin geç fazında homojen kontrastlandığı bildirilmiştir.
Enfeksiyöz aortitli bir olguda BT'de hangi periaortik bulgu bildirilmiştir?
Cevabı göster
Periaortik sıvı koleksiyonu. Kaynakta enfeksiyöz aortit olgusunda BT görüntülemesinde periaortik sıvı koleksiyonu saptanmıştır.

Kaynaklar

Bu sayfadaki 33 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 11 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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