Klinik Atölye

Teknik ve artefaktlar · Taklitçi · Orta öncelik

Akım karışma artefaktı ve psödotrombüs

Flow-mixing artifact and pseudothrombus

Akım karışma artefaktı ve psödotrombüs: yayımlanmış olgu görüntüsü, aksiyel kesit

4 adım

Görüntü: Hellerhoff, “Backwash von Kontrastmittel in V jugularis bei Gabe vom linken Arm 63M - CT KM arteriell”, Wikimedia Commons · CC BY-SA 4.0. Değişiklik: kırpıldı, yeniden boyutlandırıldı.

Özet

Kontrastlanmış ve henüz opaklaşmamış kanın aynı venöz boşlukta karışmadan ilerlemesi, özellikle ilk geçiş veya portal faz görüntülerinde trombüs benzeri düşük atenüasyon alanı oluşturabilir. BT'de defektin damar boyunca devamlılığı ve gecikmiş venöz görüntüdeki davranışı, psödotrombüsü kalıcı pıhtıdan ayırmaya yardım eder. Erken fazdaki karışım artefaktları gecikmiş görüntülerle doğrulanarak yanlış trombüs tanısı ve gereksiz ilave tetkikler önlenebilir.

Faz ve pencere

Arteriyel
Erken kontrastlı görüntülerde kan akımının yavaş karışımı, dolum kusuruna benzeyebilir; bu bulgu tek başına trombüs tanısı koydurmaz.
Gecikmiş tanısal
Venöz havuzdaki kontrastın daha dengeli dağılımı ile akım kaynaklı sınır silinir; aynı yerde kalan, duvara yaslı dolum defekti gerçek trombüs şüphesini artırır.

Önerilen pencereler: Anjiyo (G 600 / M 150), Mediasten (G 350 / M 50), Batın (G 400 / M 50), Yumuşak doku (G 400 / M 40).

BT bulguları

  • Erken faz görüntülerde görülen akım kaynaklı yalancı dolum kusurları, gerçek trombüslerden farklı olarak gecikmiş fazda kaybolur ve sabit bir duvar kütlesi gibi kalıcı değildir.
  • Gecikmiş homojenleşme — aynı IVC veya kalp boşluğu daha geç görüntülendiğinde ilk serideki kontrast sınırının kaybolması karışım artefaktını destekler.
  • Kalıcı mural dolum kusuru — geç görüntüde de aynı duvara tutunan konturun seçilmesi trombüs olasılığını yükseltir.

Normalde

Şüpheli alanı renal ven ostiumları, IVC duvarı ve gecikmiş serideki aynı anatomik kesitle karşılaştırın; gecikmiş görüntüde homojenleşme karışım lehine, kalıcı duvara yapışık defekt trombüs lehinedir.

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 s0541; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Gerçek trombüsler gecikmiş görüntülerde de aynı anda kalıcı dolum kusuru bırakır.
Tümör trombüsleri ilişkili kitleyle bağlantılı olup, bland trombüsten ayırt edilmeli; bu ayrım hastanın evrelemesi ve cerrahi planlaması için kritik öneme sahiptir.
Parakaval lipom, intrahepatik IVC çevresinde yağ birikimi olarak görülebilir ve trombüsle karışabilir.
Sağ atriyal trombüs
gecikmiş görüntüde kan havuzu homojenleşirken duvara bağlı ayrı dolum kusuru olarak kalır.
Kateter ilişkili santral ven trombüsü
kateter ucuna veya ven duvarına tutunan dolum kusuru gecikmiş fazda da izlenir.

Tuzaklar

  • Erken faz BT anjiyografide kardiyak boşluklarda görülen kontrast akım karışımı kaynaklı yalancı dolum kusurları, gecikmiş görüntülerde homojenleşerek çözünür; aynı kesitte gecikmiş faza kadar kalıcı kalan defektler ise gerçek trombüs şüphesini artırır.
  • Parakaval yağ birikimi IVC trombüsüyle karışabilir.

Kendini dene

  1. Portal fazda suprarenal IVC'de sınırları belirsiz bir dolum kusuru görülüyor; gecikmiş görüntüde aynı segment homojen biçimde kontrastlanıyor. En olası açıklama nedir?

    Cevabı göster

    Akım karışım artefaktı. Erken fazda kanın tam karışmaması geçici bir dolum kusuru oluşturabilir. Gecikmiş görüntüde kusurun kaybolması karışım artefaktını destekler; aynı yerde kalan kusur ise trombüs lehinedir.

  2. Sağ atriyumda erken faz BT anjiyografide bir dolum kusuru görülüyor. Gecikmiş görüntüde dolum kusurunun çözülmemesi gerçek trombüs şüphesini artırır; çözülmesi ise karışım artefaktını gösterir. En olası tanı nedir?

    Cevabı göster

    Sağ atriyal trombüs. Gecikmiş görüntüde kalıcı olan dolum kusuru trombüs lehinedir; çözülmesi ise akım karışım artefaktını destekler. Kateter kaynaklı artefaktlar genellikle farklı morfolojide izler bırakır; persistans ise trombüs lehinedir.

Kaynaklar

Bu sayfadaki 30 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 15 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez. İçerik yapay zekâ destekli bir süreçle güncel literatüre göre cümle cümle kaynaklarla karşılaştırıldı, ancak uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.