Arterioportal şant ve fokal hiperperfüzyon BT bulguları

Özet

Arterioportal şantta arteriyel kan, normal sinüzoidal dolaşımı kısmen atlayarak portal ven dalına ulaşır; siroz, tümör, travma veya girişim sonrasında gelişebilir. Dinamik BT'de erken portal ven opasifikasyonu ve beslediği alanda geçici arteriyel hiperatenüasyon görülebilir. Bu iki bulgunun birlikte aranması, tek başına parlak parankimi hepatoselüler karsinom sayma riskini azaltır. Şantın altında yatan portal ven tıkanıklığı veya tümör atlanırsa, yalancı odak yorumunun ötesinde klinik olarak önemli damar hastalığı da gözden kaçabilir.

Faz ve pencere

Arteriyel tanısal: Hepatik vasküler malformasyonlarda BT'de portal venin erken görüntülenmesi görülebilir. Periferik şantta düz sınırlı kama/koni biçimli parankim hiperatenüasyonu eşlik edebilir; küçük şantlarda erken damar bulgusu seçilmeyebilir.
Portal tanısal: Portal venöz fazda kama biçimli parankim hiperkontrastlanması komşu karaciğerle eşitlenebilir; hepatik perfüzyon bozukluğu alanları bu fazda izoatenüöz veya hafif hipertenüöz görünebilir.

Önerilen pencereler: Anjiyo (G 600 / M 150), Karaciğer (G 150 / M 30), Batın (G 400 / M 50).

BT bulguları

Hepatik vasküler malformasyonlarda BT'de portal ven erken görüntülenebilir.
Beslenen bölgede periferik, homojen, düz kenarlı kama ya da koni biçimli arteriyel hiperatenüasyon.
Üç boyutlu dağılımda odağın sivri ucunun hilusa yönelmesi ve damar alanı biçimini alması.
Portal fazda parankim atenüasyonlarının yakınlaşması; geçici odakta tümöre özgü yıkanma olmaması.
Şant odağındaki küçük damarlar görüntülemede sınırlı çözünürlük nedeniyle seçilemeyebilir.
Hepatik arterioportal şant altta yatan tümörle veya travma ya da girişim sonrasında ilişkili olabilir.
Hepatik perfüzyon bozukluğu arteriyel fazda geçici, homojen hiperatenuasyon gösterebilir.

Ölçütler ve sınıflamalar

Şantın bağlandığı damar sistemine göre: Hepatik vasküler şantlar bağlandıkları damar sistemine göre arteriyovenöz, arterioportal veya portovenöz olarak tanımlanır. Şantın derecesine bağlı olarak semptomlar ve yaşamı tehdit eden komplikasyonlar ortaya çıkabilir.

Normalde

Hepatik perfüzyon bozukluğunda arteriyel fazdaki geçici hiperatenuasyon portal fazda izoatenüöz veya hafif hipertenüöz hale gelebilir. Bu incelemede çevresel portal dalın ana portal venden önce parlaklaşıp parlaklaşmadığını ve onun komşuluğundaki parankimin aynı anda üçgen bir hiperatenüasyon gösterip göstermediğini karşılaştır.

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

Hepatoselüler karsinom: kitle biçimli arteriyel kontrastlanma ve portal/geç fazda yıkanma; bazen tümör trombüsü gösterir.
Fokal nodüler hiperplazi: arteriyel fazda hiperkontrastlanan kitle biçimli lezyon olup, portal venöz ve gecikmiş fazlarda çevre parankimle izoattenüe olur; tipik merkezî skar BT'de sıklıkla görülemez.
Portal ven trombozu: lümen içinde dolum kusuru ve akım havzasında olası kollateraller bulunur; şant bulgusu trombozun sebebini açıklayabilir.
Hepatik arteriyovenöz malformasyon: belirgin besleyici arter ve erken venöz drenajla daha geniş damar ağı oluşturabilir.
Hepatik damar varyasyonları: arteriyel kan akımının karaciğer segmentleri arasında yeniden dağılımına bağlı perfüzyon farkı oluşturabilir.

Tuzaklar

Hepatik arterioportal şantta portal venin erken görüntülenmesi görülebilir; eşlik eden altta yatan karaciğer anomalileri dikkatle değerlendirilmelidir.
Periferik şant odağındaki küçük damarlar sınırlı görüntüleme çözünürlüğü nedeniyle seçilemeyebilir.
Sirotik karaciğerde nontümöral arterioportal şantlar fokal hipervasküler lezyonları taklit edebilir; yalnız arteriyel hiperkontrastlanmaya dayanarak bu alanı HCC olarak değerlendirme.
Hepatik arterioportal fistül travma veya girişim sonrasında gelişebilir; görüntüleri değerlendirirken işlem öyküsünü göz önünde bulundur.

Kendini dene

Kontrastlı BT’de hepatik perfüzyon bozukluğu arteriyel fazda nasıl görünebilir?
Cevabı göster
Geçici, kama biçimli homojen hiperatenuasyon. Hepatik perfüzyon bozukluğu, arteriyel fazda geçici, kama biçimli ve homojen hiperatenuasyon alanı şeklinde görülebilir.
Sirozlu hastada kitle biçimli bir nodülde arteriyel fazda çevresel olmayan hiperkontrastlanma ve portal venöz fazda çevre karaciğere göre yıkanma izleniyor. Hangi tanı daha olasıdır?
Cevabı göster
Küçük HCC. Siroz zemininde arteriyel faz hiper-kontrastlanması ve portal venöz ya da geç faz yıkanma, HCC değerlendirmesinde kullanılan temel görüntüleme özellikleridir. Arteriyel faz hiperkontrastlanması ve yıkanma HCC’ye özgü değildir; bazı hipervasküler benign ve malign karaciğer lezyonları da bu paterni gösterebilir.

İlgili konular

Geçici hepatik atenüasyon farkı (THAD)

Kaynaklar

Bu sayfadaki 40 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 26 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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