Edinsel kistik böbrek hastalığı

Özet

Edinsel kistik böbrek hastalığı, özellikle uzun süreli böbrek yetmezliği ve diyaliz öyküsü olan kişilerde iki böbreğe yayılmış çok sayıda kistle karşımıza çıkar. Kronik böbrek hastalığında kortikal incelme ve skarlaşma görülebilir; BT'de kistler yanında solid lezyonların değerlendirilmesi de önemlidir. Kontrastsız BT kist içeriğinin yüksek atenüasyonunu ve kalsifikasyonu gösterebilir; ancak kontrast madde kullanılmadan kistin solid lezyondan ayrılması zor olabilir. ACKD’deki çok sayıda ve karmaşık kist, eşlikçi renal hücreli karsinomun görüntülemede fark edilmesini güçleştirebilir.

Faz ve pencere

Kontrastsız tanısal

Her iki böbrekte farklı boyut ve atenüasyonda kistler görülebilir; kistlerde hemorajik veya proteinöz içerik ve duvar kalsifikasyonu bulunabilir. Kontrastsız BT lezyonların atenüasyonunu gösterir; kontrast madde olmadan kistleri solid lezyonlardan ayırmak zor olabilir.

Portal tanısal

Kistler kontrastlı BT’de tipik olarak kontrastlanmaz; kalınlaşmış duvar veya septalarda kontrastlanma malignite kuşkusu doğurur. ACKD ilişkili RCC kontrastlı BT'de solid, kistik veya karma atenüasyonlu görünebilir.

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

BT bulguları

• Korteks ve medullada iki taraflı, çok sayıda ve boyutları değişken kistik boşluklar; aralarda ince parankim köprüleri kalabilir.
• Böbrek konturları atrofik, düzensiz ya da korunmuş hacimde olabilir; yalnız böbrek boyutu hastalığı dışlamaz.
• Kist içeriği kontrastsız BT'de sıvı atenüasyonunda olabilir; hemorajik veya proteinöz içerik daha yüksek atenüasyon gösterebilir ve bu bulgu tek başına solid bileşen olduğunu göstermez.
• ACKD'de kist içindeki solid bileşen kontrastlı BT'de belirgin kontrastlanma gösterebilir.
• ACKD ilişkili RCC iyi sınırlı ve dışa büyüyen bir kitle şeklinde gelişebilir; kistik ve solid bileşenler aynı lezyonda birlikte bulunabilir.
• Küçük neoplastik odaklar yoğun kist dağılımı içinde saklanabilir; böbreği seri kesitlerde ve çok düzlemli rekonstrüksiyonda taramak gerekir.
• Şüpheli renal kitlenin evrelemesinde kontrastlı BT ile venöz tutulumu değerlendirin.
• ACKD’de böbrekler atrofik veya normal boyutta olabilir ve iki böbrekte çok sayıda mikrokist görülebilir.

Normalde

Normal böbrekte korteks ve medulla kesintisiz, düzenli parankim oluşturur; renal sinüs yağlıdır ve bu alana yayılmış çoklu kistik boşluklar bulunmaz. Aynı kesitte iki böbreğin kalan kortikal dokusunu karşılaştırın; kontrastsız seride yoğun görünen kist içeriğini portal serideki gerçek nodüler doku boyanmasından ayırın.

Ayırıcı tanı

Otozomal dominant polikistik böbrek hastalığı

böbrekler çoğu kez belirgin büyür ve karaciğer kistleri eşlik edebilir.

Basit renal kist

düzgün ince duvarlı, homojen sıvı içerikli ve kontrastlanmayan odaktır.

ACKD ilişkili renal hücreli karsinom

kist içinde mural doku veya kistler arasında kontrastlanan solid bileşen oluşturabilir.

Kanamalı veya proteinöz kist kontrastsız BT'de yüksek atenüasyon gösterebilir; kontrastlı BT'de kistler tipik olarak kontrastlanmaz.

Renal lenfoma, infiltratif renal kitlelerin ayırıcı tanısında yer alır.

Tuzaklar

• Yoğun kist içeriğini kontrastlanan tümör sanmayın; başlangıç atenüasyonunu kontrast sonrası aynı odakla karşılaştırın.
• Küçük mural nodüller veya duvar kalınlaşmaları, hemorajik/proteinöz içerikle karışabilir; kontrastlı serilerde gerçek vasküler boyanma ayrıştırılmalıdır.
• Kalıtsal polikistik hastalıkla ayrımda yalnız kist sayısına yaslanmayın; böbrek hacmini ve karaciğer kistlerini de görüntü alanına katın.
• Kontrastsız BT’de intrarenal, kontrastlanmayan ve 3 cm veya daha büyük hiperatenuan kitleler Bosniak IIF kapsamında sınıflandırılır.

Kendini dene

1. Kontrastlı BT'de ACKD ilişkili renal hücreli karsinom hangi atenüasyon paterninde görülebilir?

   • Solid, kistik veya solid-kistik paternlerde
   • Yalnızca basit sıvı atenüasyonunda
   • Her zaman yağ atenüasyonunda
   • Yalnızca kalsifikasyon şeklinde
   Cevabı göster

   Solid, kistik veya solid-kistik paternlerde. ACKD ilişkili renal hücreli karsinom kontrastlı BT'de solid, kistik veya solid-kistik paternlerde görülebilir.

2. Kaynağa göre kontrastsız BT'de yüksek atenüasyonlu renal kist içeriği hangi iki durumla ilişkili olabilir?

   • Hemoraji veya yüksek protein içeriği
   • Basit sıvı veya idrar retansiyonu
   • Kalsifikasyon veya makroskopik yağ
   • Enfeksiyon veya hidronefroz
   Cevabı göster

   Hemoraji veya yüksek protein içeriği. Kist içindeki kanama veya yüksek protein içeriği kontrastsız BT'de yüksek atenüasyonlu görünüm oluşturabilir.

İlgili konular

• Edinsel kistik hastalıkla ilişkili RCC
• Berrak hücreli renal hücreli karsinom
• Basit böbrek kisti

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 19 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.