Özet
Kontrastlı BT anjiyografide endogreft trombozu, greft lümeninde tam veya kısmi opasifikasyon kaybı (trombotik oklüzyon) olarak izlenir. BT anjiyografi, endogreft oklüzyonunun varlığını ve uzanımını değerlendirmede kullanılır; BT, endovasküler aort onarımı sonrası komplikasyonların görüntüleme izleminin temel yöntemidir. Greft kıvrılması tromboz veya oklüzyonla ilişkili olabilir; endogreft çökmesi de bildirilen cihaz komplikasyonlarındandır. Oklüzyonun uzanımı, böbrek perfüzyonu ve alt ekstremite kollateral dolaşımı BT görüntülemede değerlendirilebilir.
Faz ve pencere
- BTA tanısal
- Kontrastlı BT'de endogreftin tam trombotik oklüzyonu gösterilebilir. BT anjiyografide oklüzyonun distal uzanımı ve alt ekstremite kollateral dolaşımı gösterilebilir.
Önerilen pencereler G genişlik, M merkez; değerler Hounsfield birimi (HU)
- AnjiyoG 600 / M +150
- MediastenG 350 / M +50
BT bulguları
- Endogreft trombozunun varlığı ve uzanımı kontrastlı BT'de değerlendirilebilir; aksiyel kaynak görüntüler trombüsü belirlemede, çok düzlemli rekonstrüksiyonlar ise damar anatomisini değerlendirmede kullanılır.
- Endogreft komplikasyonları arasında kıvrılma, stenoz ve tromboz yer alır.
- Tam greft oklüzyonu, kontrastlı görüntülemede greft lümeninde tam opasifikasyon kaybı veya ani opasifikasyon durması olarak izlenir.
- Oklüzyonun distal uzanımı ve alt ekstremite kollateral dolaşım BT anjiyografide değerlendirilebilir.
- Endogreftte mekanik kompresyon stenoz ve tromboza yol açabilir; kıvrılma ve çökme de bildirilen cihaz komplikasyonlarındandır.
- Aort grefti trombozu veya kıvrılması ekstremite ve mezenter iskemisine yol açabilir.
- Endoleak değerlendirmesinde anevrizma kesesi ile endogreft bütünlüğünü birlikte inceleyin.
- BT anjiyografide oklüzyonun greft gövdesi ve dallar boyunca uzanımını ve alt ekstremite kollateral dolaşımını değerlendirin.
Normalde
Patent endogreftte kontrastlı görüntülemede greft lümeninde kesintisiz akım ve opasifikasyon izlenir. Greft açıklığı BT anjiyografiyle değerlendirilir; kontrastsız seri, beklenen postoperatif bulguların komplikasyonları taklit ettiği durumlarda ayırıcı değerlendirmeye yardımcı olabilir.
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
- Tip II endoleak, EVAR sonrası en sık görülen endoleak alt tipidir.
- Greft kıvrılması veya mekanik çökme
- keskin açılanma ya da lümenin içe katlanması akım kanalını daraltabilir; kıvrılma tromboz ve oklüzyonla ilişkili olabilir.
- Aort cerrahisi sonrası beklenen BT görünümleri diseksiyon gibi komplikasyonları taklit edebilir; tipik görünüm ve yerleşim ayırıcı değerlendirmede yardımcı olur.
- Greft enfeksiyonunda perigraft gaz ve sıvı ile greft-bağırsak fistülü görülebilir.
- Postoperatif beklenen materyallerin komplikasyondan ayrımında önceden kontrast serisi ve anatomik yerleşim değerlendirmesi yardımcı olur.
Tuzaklar
- Endoleak değerlendirmesinde anevrizma kesesi ile endogreft bütünlüğünü birlikte inceleyin.
- Cerrahi greft katlantısı şüphesinde, aort cerrahisi sonrası beklenen BT görünümlerinin komplikasyonları taklit edebileceğini ve tipik görünüm ile yerleşimin ayırıcı değerlendirmeye yardımcı olduğunu dikkate alın.
- Teknik olarak yetersiz kontrast opasifikasyonu değerlendirmeyi güçleştirebilir; BT anjiyografide greft oklüzyonunun uzanımını ve distal kollateral dolaşımı birlikte inceleyin.
Kendini dene
EVAR sonrası BT'de endogreftin ana gövdesinden her iki iliak kola uzanan tam trombotik tıkanıklık görülüyor. En olası bulgu hangisidir?
Cevabı göster
Tam greft trombozu. Kontrastlı BT'de endogreft ana gövdesi ile her iki iliak kolu kapsayan tam trombotik oklüzyon, tam greft trombozunu destekler.
Endogreftin tam oklüzyonunu gösteren BT anjiyografide alt ekstremitelerde yaygın kollateral dolaşım görülmesi en çok neyi düşündürür?
Cevabı göster
Kronik ilerleyici iskemi. Kaynak olguda BT anjiyografide alt ekstremitelere uzanan yaygın kollateral dolaşım kronik ilerleyici iskemiyle ilişkilendirilmiştir.
Kaynaklar
Bu sayfadaki 34 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 26 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.