Aksesuar renal arter ve erken dallanma

Özet

Aksesuar renal arter, ana renal arterden ayrı köken alan ve böbreğe ek kan sağlayan damardır; erken dallanmada ise ana arter hilusa ulaşmadan dallara ayrılır. BT anjiyografi (BTA), arter sayısını, aortik veya iliak kökenleri, böbreğe giriş kutbunu, dallanma biçimini ve lümen darlığı olup olmadığını ameliyat öncesi haritalamaya yarar. Damarların sayısını veya alt kutbu besleyen dalı atlamak donör nefrektomisi, transplantasyon ya da renal cerrahi planını etkileyebilir. Yetersiz arteriyel opasifikasyon küçük aksesuar arterlerin izlenememesine veya darlık değerlendirmenin sınırlanmasına yol açabilir.

Faz ve pencere

Arteriyel faz tanısal

Arteriyel faz ince kesitlerde ana renal arterden ayrı aortik/iliak çıkışlı aksesuar damar, hilusa eşlik eden arter veya doğrudan üst/alt kutba giren polar arter olarak izlenir; ana arterin erken dalı ostiumdan kısa mesafede ayrılır. Lümen opasifikasyonu darlık, ostial plak ve dal anatomisini değerlendirmeyi sağlar.

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

BT bulguları

• Aortadan ana renal arter ostiumundan ayrı çıkan ve böbreğe giren ek arter saptanır; daha aşağıda iliak arter kaynaklı damar da görülebilir.
• Aksesuar hilar arter ana renal arterle birlikte hilustan parankime girer; polar/aberran arter böbreğe doğrudan üst veya alt kutuptan ulaşabilir.
• Her damarın kökeni, seyri, çapı ve böbreğe giriş bölgesi aksiyel kesit ve çok düzlemli rekonstrüksiyonlarda izlenebilir.
• Ana renal arter hilusa ulaşmadan dallara ayrılıyorsa erken/pre-hilar dallanma vardır; ilk dalın ostiuma uzaklığı ölçülüp bildirilir.
• Segmental arterlerin parankim içi dağılımı ve olası kutup beslenmesi cerrahi açıdan anlamlı damar haritasını tamamlar.
• Fokal lümen daralması varsa ostium ve proksimal arter boyunca plak, duvar düzensizliği ve distal dalların dolumu incelenir.
• İnce kalibrasyonlu alt kutup arteri, üst kutup arteri veya çoklu ana arter dalları ayrı ayrı sayılmalı; yalnız ana damar görüntüsüyle yetinilmemelidir.

Ölçütler ve sınıflamalar

Erken (prehilar) renal arter dallanması

İlk dal renal arter ostiumundan ≤1,5 cm uzaklıkta çıkar

Normalde

Tipik renal arter anatomisinde her böbrek çoğunlukla aortadan çıkan tek ana renal arterle beslenir; ana arter hilusa kadar izlenir ve ardından segmental dallara ayrılır. BTA'da kıyas için her renal arter ostiumunu aort boyunca sayın, aksesuar köken bulunup bulunmadığını ve ana arterin ilk dalının hilusa göre yerini gösterin; varyant damar da normal arter gibi kontrastlanıp parankime ulaşır.

Ayırıcı tanı

Renal arter stenozu, renal arter varyantlarından ayrı bir anatomik sorun olarak değerlendirilir.

Renal ven varyantı

venöz fazda dolan ve böbrekten vena kavaya dönen damardır; BTA'da arterden farklı zamanlamada opaklaşır ve akım yönü/bağlantısı ayrıdır.

Segmental renal arter dalı

ana renal arterden ayrıldıktan sonra böbrek içinde dallanır; ayrı aortik/iliak kökenli aksesuar arter değildir.

Tuzaklar

• Arteriyel opasifikasyon yetersizse küçük polar damar fark edilmeyebilir veya dar görünebilir; değerlendirmeyi damar fazı ve görüntü kalitesiyle sınırlayın.
• Aksiyel tek kesitte aksesuar damar çok kısa görünebilir; aortadan çıkışını böbreğe girişine dek koronal/sagittal MPR ve damar izleme ile takip edin.
• Erken dalı aksesuar arter olarak saymayın: ayrı ostiumdan çıkıp çıkmadığını aort ve ana renal arter kökenlerini izleyerek ayırın.
• Erken bifurkasyon, küçük damar çapı ve yüksek dereceli stenozu ayrı anatomik bulgular olarak değerlendirin.

Kendini dene

1. BTA'da ana renal arterden ayrı bir aortik ostiumdan çıkan ince damar doğrudan alt kutba ulaşıyor. Bu anatomi nasıl adlandırılır?

   • Aksesuar polar renal arter
   • Erken ana arter dalı
   • Renal arter anevrizması
   • Renal ven varyantı
   Cevabı göster

   Aksesuar polar renal arter. Ayrı ostiumdan çıkan ve doğrudan kutba ulaşan damar aksesuar polar renal arterdir. Erken dallanan renal arterde tek arter gövdesi hilusa ulaşmadan bölünür; aksesuar renal arter ise ayrı kökenli ek bir damardır.

2. Ana renal arter tek ostiumdan çıkıyor; ilk dal ostiuma yakın ayrılıyor. Varyantı adlandırmak için hangi ölçüm gerekir?

   • Ostium-ilk dal uzaklığı
   • Arter-ven açı farkı
   • Böbrek uzun ekseni
   • Aort çapı
   Cevabı göster

   Ostium-ilk dal uzaklığı. Erken dallanma, ana renal arter ostiumundan ilk dalın çıktığı yere olan mesafeyle tanımlanır; kaynağın kullandığı eşik 1.5 cm'dir. Kaynağa göre erken dallanma, ostiumdan 1,5 cm içinde gerçekleşen dallanmadır.

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 5 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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