Arterioportal şant ve geçici hepatik atenüasyon farkı (THAD) BT bulguları

Özet

Arterioportal şant, hepatik arter sistemi ile portal venöz sistem arasında bağlantıdır; THAD, bölgesel hepatik arter ve portal venöz kanlanma oranındaki değişikliğe bağlı olarak arteriyel faz BT'de geçici parankim kontrastlanması şeklinde görülür. THAD, arteriyel faz BT'de kama biçimli ve geçici bir hiperatenüasyon alanı olarak görülebilir; arteriyel kanlanma oranının artması bölgesel atenüasyonu yükseltirken portal fazda karaciğer belirgin ve yaygın biçimde kontrastlanır. THAD'ların hipervasküler tümörleri taklit edebileceğini ve küçük arterioportal şantların nodüler görünebileceğini bilmek, görüntülerin daha doğru değerlendirilmesine yardımcı olur. THAD'nin olası nedenleri arasında portal ven akımındaki azalma, arterioportal şant, tümör, apse ve inflamatuvar hastalıklar bulunduğundan, altta yatan anormallikler ayrıca değerlendirilmelidir.

Faz ve pencere

Arteriyel tanısal: Arteriyel fazda geçici hiperatenüasyon alanı görülebilir; portal akım azalması, arterioportal şant veya diğer altta yatan intrahepatik anormallikler araştırılmalıdır.
Portal tanısal: THAD arteriyel faz BT'de geçici kontrastlanma alanı olarak görülür; portal fazda kontrastlanma farkının sürüp sürmediği değerlendirilmelidir.
Gecikmiş: Arterioportal şant alanları denge fazında izoatenü olabilir; bu nedenle arteriyel fazdaki geçici kontrastlanma görünümü diğer fazlarla birlikte değerlendirilmelidir.

Önerilen pencereler: Batın (G 400 / M 50), Karaciğer (G 150 / M 30).

BT bulguları

Arteriyel fazda kama, üçgen veya coğrafi şekilli hiperatenüasyon; sıklıkla periferik/subkapsüler dağılım
Arterioportal şantlar geçici kama biçimli veya nodüler kontrastlanma alanları oluşturabilir; görünüm özellikle sirotik karaciğerde hipervasküler tümörlerle karışabilir.
Portal fazda lezyon benzeri farkın kaybolup çevre parankime yaklaşması
Arterioportal şantlar, hipervasküler tümörleri taklit edebilen geçici parankim kontrastlanma alanları oluşturabilir.
Arterioportal şantlar ve portal ven akımını azaltan anomaliler THAD'ye yol açabilir; bunların saptanması olası nedeni değerlendirmeye yardımcı olur.
Portal dal tıkanıklığı, tümör, inflamasyon veya cerrahi/girişim odağına komşu bölgesel perfüzyon değişikliği

Normalde

Normal dinamik BT’de karaciğer parankimi arteriyel fazda hafif ve görece homojen, portal fazda ise yaygın ve dengeli kontrastlanır. Portal fazda karaciğerin kontrastlanması belirgin ve yaygın hale gelir; arteriyel fazdaki geçici hiperatenüasyonun diğer fazlardaki görünümüyle karşılaştırılması perfüzyon farkını değerlendirmeye yardımcı olur.

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

Arterioportal şantlar, özellikle sirotik karaciğerde amorf veya nodüler görünümleri nedeniyle hipervasküler tümörlerle karışabilir.
Karaciğer infarktı: portal fazda kontrastlanmama sürer ve segmental damar dağılımındaki kama silinmez.
Üçüncü giriş etkileri fokal yağlanma veya yağdan korunmuş alanlar gibi yalancı lezyonlara yol açabilir; THAD ise bölgesel hepatik arter ve portal ven kanlanma oranındaki değişiklikle ilişkilidir.
Portal ven dal trombozu: ilgili dalda kalıcı dolum defekti/sonlanma ve ona uyan perfüzyon farkı olabilir; THAD tek başına şantın nedenini göstermez.

Tuzaklar

Arteriyel tek fazdaki kama hiperatenüasyonu metastaz veya HCC diye adlandırmayın; portal fazda aynı alanın eşitlenmesini ve damarların içinden geçişini kontrol edin.
THAD farklı portal venöz akım bozuklukları, arterioportal şantlar, tümörler, apseler ve inflamatuvar hastalıklarla ilişkili olabilir; olası nedenler ayrıca değerlendirilmelidir.
Hepatik arter ve portal ven kontrast bolusunun karaciğere varış zamanları farklı olduğundan, fazlar arası karaciğer kontrastlanması bu zamanlama dikkate alınarak değerlendirilmelidir.

Kendini dene

Arteriyel faz BT'de bölgesel hepatik arter ve portal ven kanlanma oranındaki değişikliğe bağlı geçici parankim kontrastlanma alanına ne ad verilir?
Cevabı göster
THAD. Bölgesel arteriyel ve portal venöz kanlanma oranındaki değişiklik, arteriyel faz BT’de geçici bir kontrastlanma alanı oluşturabilir; bu görünüm THAD olarak adlandırılır.
Portal venöz akımın bölgesel azalması, arteriyel faz BT'de hangi geçici karaciğer görünümüne yol açabilir?
Cevabı göster
THAD. Portal akım azaldığında, bölgeyi besleyen hepatik arter kanı opaklaşmamış portal kanla seyrelmez; bu nedenle arteriyel fazda fokal atenüasyon artışı görülebilir.

İlgili konular

Fokal yağlanma ve yağdan korunmuş alan

Kaynaklar

Bu sayfadaki 31 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 22 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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