Renal ven kompresyonu ve venöz kollateraller

Özet

Sol renal ven aortomezenterik aralıkta, retroperitoneal kitle veya başka komşu yapıların basısıyla daralabilir; belirgin basıya gonadal ven genişlemesi ve perirenal, periüreteral veya pelvik kollateraller eşlik edebilir. Kontrastlı BT bası seviyesini ve varsa hiler genişleme ile kollateral damarları gösterebilir. Sol renal ven basısının BT'de görülmesi tek başına klinik nutcracker sendromunu göstermez; anatomik bulgu klinik belirti ve bağlamla birlikte değerlendirilir. Basıya neden olan kitleyi ya da lümen içi trombüsü atlamak altta yatan nedeni yanlış sınıflandırabilir.

Faz ve pencere

Portal tanısal

Venöz faz BT, sol renal venin dıştan basıldığı segmenti ve varsa basının hiler tarafındaki venöz genişleme ile kontrastlanan kollateral damarları gösterebilir. Kontrastlı BT, primer kitleyle bütünlük gösteren kontrastlanan tümöral trombüs ile diğer tromboz veya dış bası nedenlerini ayırt etmede kritik rol oynar.

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

BT bulguları

• Fokal sol renal ven daralması — lümenin komşu arter, vertebra veya yumuşak doku kitlesi düzeyinde basıklaşması.
• Hiler venöz genişleme — daralmanın renal hilus tarafında ven çapının artması.
• Gonadal kollateral — sol gonadal venin genişlemesi ve pelvis yönündeki devamı, renal ven basısına eşlik edebilen kollateral akım yolunu gösterir.
• Perirenal ve pelvik kollateraller — renal hilus, periüreteral alan veya pelvis çevresinde belirginleşen venöz varisler eşlik edebilir.
• Venöz yan kollar — sol gonadal ve lomber venlerin belirginleşmesi ile pelvik kollateraller, sol renal ven basısına bağlı kollateral akımın yansıması olarak değerlendirilir.
• Basının nedeni — retroperitoneal kitle, lenfadenopati, arteriyel komşuluk veya varyant venöz seyir.
• Eşlik eden renal ven trombüsü — bası segmentinde veya hiler ven lümeninde kontrastlı incelemede kontrastlanmayan dolum defekti.

Normalde

Normalde sol renal ven renal hilustan vena kava inferiora (VKİ) uzanır ve genellikle aortanın önünden geçer; gonadal, adrenal ve retroperitoneal venler renal venin yan dalları olabilir. Bası düzeyindeki lümen çapını hiler bölümle karşılaştırırken kesit düzlemi ve venin oblik seyrini dikkate alın; gonadal ve periüreteral/pelvik kollaterallerin devamını izleyin.

Ayırıcı tanı

Anterior nutcracker fenomeni

sol renal ven aorta ile SMA arasında daralır ve hiler genişleme ya da kollateraller eşlik edebilir; sendrom adlandırması klinik bulgularla ilişkilendirilmelidir.

Renal ven trombozu

lümen içinde kontrastlanmayan pıhtı bulunur; bası kollaterali tek başına bu görünümü vermez.

Tümör invazyonu

renal kitleyle devamlı ve kontrastlanan doku ven içine uzanır.

Retroperitoneal fibrozis

aorta çevresinde plak benzeri yumuşak doku üreterleri ve damarları sarabilir.

Venöz varyant

retroaortik veya sirkumaortik sol renal ven doğal seyir varyantıdır; retroaortik ven aorta ile vertebra arasında ayrıca basıya uğrayabilir.

Tuzaklar

• Gonadal ven genişlemesini tek başına kompresyon tanısı saymayın; bası segmentini ve gonadal, periüreteral/pelvik, adrenal veya lomber ven bağlantılarını birlikte değerlendirin.
• Sol renal venin SMA-aorta arasındaki anatomik daralmasını semptom yokken sendrom diye adlandırmayın.
• Çok düzlemli yeniden yapılandırma (MPR) ve çok fazlı inceleme, sol renal venin benzersiz seyrini detaylandırmaya ve farklı patolojileri ayırt etmeye yardımcı olur.

Kendini dene

1. Sol renal venin daralma öncesindeki hiler kesimi geniş, gonadal ven belirgin; lümen açık ve retroperitoneal nodal kitle veni dıştan itiyor. En olası mekanizma nedir?

   • Dıştan venöz bası
   • Renal ven trombozu
   • Renal arter embolisi
   • Üreter taşı
   Cevabı göster

   Dıştan venöz bası. Nodal kitleyle dıştan itilme ve renal ven lümeninin açık olması, renal ven trombozundan çok dış bası mekanizmasını destekler.

2. Geniş gonadal venle birlikte sol renal venin aorta-SMA aralığında daralması görülüyor; klinik belirti bilgisi verilmemiş. Bası için en uygun anatomik açıklama hangisidir?

   • Anterior nutcracker fenomeni
   • May-Thurner sendromu
   • Posterior nutcracker
   • Renal arter stenozu
   Cevabı göster

   Anterior nutcracker fenomeni. Aorta ile SMA arasındaki sol renal ven daralması anterior nutcracker fenomeninin anatomik tarifidir; tek başına klinik nutcracker sendromunu kanıtlamaz. May-Thurner sol ana iliak venin sağ ana iliak arter ile beşinci lumbar vertebra arasındaki basısıdır; posterior nutcracker retroaortik sol renal venin aorta ile vertebra arasında sıkışmasıdır.

İlgili konular

• Anterior Nutcracker sendromu
• Renal ven trombozu

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 4 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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