Junctional parankimal defekt

Özet

Bu varyant görüntülemede bir tümör ya da renal skar ile karıştırılabilir. Kontrastlı BT'de persistan fetal lobülasyonun tipik görünümü, bu varyantın tümör ve renal skardan ayırt edilmesine yardımcı olabilir. Böbrekte tesadüfen saptanan kitle benzeri bulguların yanlış yorumlanması pahalı incelemelere, hasta kaygısına ve gereksiz radyasyon maruziyetine yol açabilir.

Okuma sırası

1. Üst pol-orta pol bileşkesi. Koronal kesitlerde böbrek yüzeyini inceleyin ve medüller piramitler arasındaki çentiklenmeleri arayın.
2. Renal sinüs yağ dokusu. Girinti saptandığında, böbrek yüzeyinde piramitler arasında yer alıp almadığını ve eşlik eden kaliks clubbing'i bulunup bulunmadığını değerlendirin.
3. Defekt çevresi korteks. Kontrastlı BT'de böbrek yüzeyindeki çentiklenmenin tipik konjenital varyant görünümünü değerlendirin.
4. Komşu kaliks ve renal hilus. Çentikle birlikte kaliks clubbing'i görülürse postpiyelonefritik skar olasılığını değerlendirin.

Faz ve pencere

Kontrastsız tanısal

Kontrastsız görüntülerde bu varyant, renal lobüllerin eksik birleşmesine bağlı böbrek yüzeyinde küçük bir çentik biçiminde izlenir.

Nefrografik

Kontrastlı görüntülerde bu tür varyantların komşu parankimle aynı kontrastlanmayı göstermesi beklenir; bağımsız kontrastlanan bir solid nodül ise gerçek bir solid lezyonu düşündürür.

BT bulguları

• Bu varyant odaklarını kortikal bir tümör odağından ayıran temel ipucu, kontrastlı görüntülerde komşu parankimle aynı kontrastlanma paternini göstermeleridir.
• Odak içinde ayrı bir yumuşak doku nodülü beklenmez; varyant, komşu renal parankimle aynı yoğunluk ve kontrastlanmayı gösterir.
• Persistan fetal lobülasyon, renal yüzeyde piramitler arasında bir girinti şeklinde izlenir.
• Junctional defekt ile postpiyelonefritik skarın ayırımında, skarın medüller piramitler üzerinde yer alması ve papilla retraksiyonuna bağlı kaliks clubbing'i göstermesi destekleyici olabilir.
• Bu tür varyantların değerlendirilmesinde multiplanar koronal reformat kontrastlı BT kesitleri yardımcı olabilir.

Normalde

Kontrastlı görüntülemede normal renal parankim, çevresindeki renal parankimle aynı kontrastlanma paternini gösterir.

Ayırıcı tanı

Anjiyomiyolipom

ayrı kortikal nodül şeklindedir ve çoğunlukla sinüs yağından bağımsız makroskopik yağ içeriği gösterir.

Kortikal skar

medüller piramitlerin üzerinde yer alabilir; eşlik eden kaliks clubbing'i papilla retraksiyonuna bağlıdır.

Renal hücreli karsinom

kontrastsız BT'de genellikle yumuşak doku atenüasyonundadır; kontrastlanma paterni tümör alt tipine göre değişebilir.

Hipertrofik Bertin kolonu

böbreğin orta kısmında piramitler arasında yer alan, kortikal doku ile aynı yoğunlukta ve kontrastlanma paterni gösteren kitlesel görünümde bir anatomi varyantıdır.

Persistan fetal lobülasyonda renal yüzey girintileri, çocuklukta renal lobüllerin eksik füzyonuna bağlı olarak piramitler arasında oluşur.

Tuzaklar

• Renal lezyonda makroskopik yağ saptanması, klasik anjiyomiyolipom için özgül bir bulgudur.
• Renal lezyonda makroskopik yağ saptanması, klasik anjiyomiyolipom lehine spesifik bir bulgudur.
• Kontrastlı görüntülemede, psödotümörler ile infiltratif solid renal lezyonların ayrımında çevre parankimle aynı kontrastlanma paterni yardımcıdır.

Kendini dene

1. Renal yüzeyde piramitler arasında, renal lobüllerin çocuklukta eksik birleşmesine bağlı oluşan girinti hangi normal varyanttır?

   • Persistan fetal lobülasyon
   • Hipertrofik Bertin kolonu
   • Dromedary hörgç
   • Klasik anjiyomiyolipom
   Cevabı göster

   Persistan fetal lobülasyon. Persistan fetal lobülasyon, çocukluk döneminde renal lobüllerin eksik birleşmesine bağlı olarak piramitler arasında yüzey girintileri oluşturur.

2. Böbrek yüzeyindeki çentiğin altında kaliks deformasyonu (clubbing) ve papilla retraksiyonu görülüyorsa bu bulgu hangi patoloji lehinedir?

   • Persistan fetal lobülasyon
   • Postpiyelonefritik kortikal skar
   • Junctional parankimal defekt
   • Dromedary hörgç
   Cevabı göster

   Postpiyelonefritik kortikal skar. Postpiyelonefritik renal skarlar, papilla retraksiyonuna bağlı kaliks clubbing'iyle ayırt edilebilir.

İlgili konular

• Bertin kolonu hipertrofisi
• Kalıcı fetal lobülasyon
• Kortikal skar/atrofi

Kaynaklar

Bu sayfadaki 28 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 23 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.