Klinik Atölye

Karaciğer: fokal lezyonlar · Taklitçi · Düşük öncelik

Geçici hepatik atenüasyon farkı (THAD)

Transient hepatic attenuation difference

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Geçici hepatik atenüasyon farkı (THAD): yayımlanmış olgu görüntüsü, aksiyel kesit
Görüntü konuyu kısmen gösteriyor; bulgunun bir bölümü seçilebilir.

5 adım

Görüntü: Kobayashi S., “Hepatic pseudolesions caused by alterations in intrahepatic hemodynamics.” 2021, Figure 2. PMC8678815 · doi:10.3748/wjg.v27.i46.7894 · CC BY-NC 4.0. Değişiklik: yeniden boyutlandırıldı.

Özet

THAD, bölgesel portal akım azalması veya arteriyel katkı artışının dinamik kontrastlı BT'de oluşturduğu geçici parankim görünümüdür. Arteriyel fazda kitle gibi parlak seçilebildiği için özellikle sirotik karaciğerde hepatoselüler karsinomla karıştırılabilir. Fazlar arası kaybolması, kama biçimi ve içinden geçen normal damarlar BT'nin başlıca ayırt ettirici katkısıdır. Gerçek nodül sanılması gereksiz ileri incelemeye; gerçek bir tümör çevresindeki perfüzyon değişikliğinin lezyon sınırına katılması ise boyutun hatalı değerlendirilmesine yol açabilir.

Faz ve pencere

Arteriyel tanısal
Arteriyel fazda çoğunlukla periferik, düz kenarlı kama veya üçgen biçimli hiperatenüöz parankim görülür; alan gerçek bir solid kitle gibi yuvarlak kontur kazanmaz ve içinden normal damar dalları geçebilir.
Portal tanısal
Portal venöz fazda bölge çevre parankimle izodens hale gelir; kalıcı nodüler kontrastlanma veya kitle etkisi oluşturan kontur değişikliği gözlenmez.
Gecikmiş tanısal
Gecikmiş faz tek başına THAD tanısı koydurmaz. Tipik perfüzyon psödolezyonu arteriyel faz dışındaki serilerde silinir ve kitle etkisi oluşturmaz; başka fazlarda süren yuvarlak, kitle biçimli görünüm gerçek fokal lezyon olasılığını artırır.

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

BT bulguları

  • Arteriyel fazda kama, üçgen veya koni biçimli bölgesel hiperatenüasyon; çoğu kez subkapsüler yerleşim.
  • Alan kenarının düz ve segmental perfüzyon sınırına uyan görünümü; yuvarlak, ekspansil bir kitle konturu oluşturmaması.
  • Portal ve hepatik ven dallarının parankim odağından doğal kalibrasyon ve doğrultuyla geçmesi.
  • Portal fazda çevre karaciğerle atenüasyonun eşitlenmesi; kalıcı nodüler kontrastlanma kusurunun bulunmaması.
  • THAD alanı geçici parankimal kontrastlanma farkıdır; normal damarların bu alandan geçmesi gerçek kitlelerden ayrımına yardımcı olur.
  • Portal ven trombozu, kompresyonu ya da tümör çevresi gibi yerel akım değişikliğini açıklayabilecek nedenin eşlik edebilmesi.

Normalde

THAD değerlendirmesinde, arteriyel fazdaki bölgesel kontrastlanmanın portal venöz fazda çevre parankimle normal ya da normale yakın atenüasyona dönüp dönmediğini ve normal damarların alan içinden geçip geçmediğini karşılaştır. Kıyaslamada kuşkulu alanın aynı anatomik düzeydeki komşu segmentlerden yalnız arteriyel fazda ayrışıp ayrışmadığını ve portal ven dalının içinden itilmeden geçip geçmediğini kontrol et.

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

HCC arteriyel faz hiperatenüansı ve portal ya da gecikmiş faz yıkanması gösterebilir; THAD ise kama biçimi, alan içinden geçen normal damarlar ve portal fazda normale yakın atenüasyona dönmesiyle ayırt edilebilir.
Fokal nodüler hiperplazi, arteriyel kontrastlanma ve merkezî skar gösterebilen bir karaciğer lezyonudur.
Hemangiom
periferik kesintili nodüler kontrastlanma ve sonraki fazlarda içe doğru dolum eğilimi gösterir.
Hepatik infarkt gerçek parankimal iskemi/infarktı ifade eder; fokal portal venöz obstrüksiyona eşlik eden heterojen karaciğer kontrastlanması ise THAD olarak görülebilir ve gerçek parankimal infarktla karıştırılmamalıdır.

Tuzaklar

  • Arteriyel fazın yanlış zamanlanması kontrastlanmayı ve atenüasyon ölçümlerini etkileyebilir; değerlendirmede aortadaki atenüasyonu referans almak yardımcı olabilir.
  • THAD genellikle lezyonun periferinde bulunur ve lezyonla komşudur; hastanın takibinde THAD alanını lezyon çapına ekleyerek hastalığın boyutunu abartmamak gerekir.
  • Tipik THAD portal venöz fazda çevre parankimle normal ya da normale yakın atenüasyona döner; diğer fazlarda süren bir kontrastlanma farkı tipik geçici görünümle uyumlu değildir.

Kendini dene

  1. THAD olarak tanımlanan arteriyel fazdaki kama biçimli alan, portal venöz fazda tipik olarak nasıl değişir?

    Cevabı göster

    Çevre karaciğer parankimiyle aynı ya da yakın atenüasyona döner. THAD alanı portal venöz fazda normal ya da normale yakın atenüasyona döner.

  2. Arteriyel seride kama biçimli karaciğer hiperatenüasyonu görülüyor. Hangi bulgu, THAD'ın beklenen fazlar arası görünümüne uymaz?

    Cevabı göster

    Portal fazda kalıcı, yuvarlak ve kitle biçimli hipoatenüan odağın kalması. THAD tipik olarak arteriyel fazda kama biçimli görünür, normal damarları içerir ve portal/venöz dönemde çevre parankimle izodens hale gelir. Kalıcı, yuvarlak ve kitle biçimli odak yalnız geçici perfüzyon farkıyla açıklanmaz; gerçek fokal lezyon açısından değerlendirilmelidir.

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Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 9 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.