Mesane amiloidozu

Özet

Aralıklı hematüri veya irritatif işeme yakınmaları olan erişkinde mesane amiloidozu, ürotelyal tümör görünümünü taklit edebilen nadir bir depo hastalığıdır. BT'de fokal nodüler ya da plak tarzı duvar kalınlaşması, polipoid kitle veya daha yaygın duvar tutulumu görülebilir; görüntüleme tek başına amiloidi kanserden güvenilir biçimde ayıramaz. BT ürografi lezyonun yerini, yayılımını ve üst üriner sistemi göstererek hematüri değerlendirmesine katkı sağlar. Bulguyu yalnız tümör olarak etiketlemek biyopsiyle tanınabilecek taklitçiyi kaçırabilir; amiloid varsayımıyla maligniteyi dışlamamak da önemlidir.

Faz ve pencere

Kontrastsız

Duvar içinde ince çizgisel submukozal veya intramural kalsifikasyon varsa seçilir; kalsifikasyon amiloidoz için karakteristik olabilir, fakat yokluğu hastalığı dışlamaz.

Ekskresyon tanısal

Mesane yeterince doluyken fokal/plak tarzı kalınlaşma, nodüler veya polipoid kontur ve kontrastlanan duvar lezyonu görülebilir; eşlik eden lümen dolum defekti ile üst üriner sistem de haritalanır. Bu görünüm amiloidozu ürotelyal kanserden ayırmaz; kesin tanı doku incelemesine dayanır.

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

BT bulguları

• Fokal eksantrik duvar kalınlaşması — mesane doluyken de devam eden plak veya nodül şeklinde izlenebilir.
• Polipoid intralüminal komponent — kontrastlı incelemede duvarla devamlı ve kontrastlanan yumuşak doku olarak belirir.
• Yaygın duvar tutulumu — tek bir tümör odağından farklı olarak birden fazla duvar segmentinde düzensiz kalınlaşma oluşturabilir.
• Submukozal/intramural çizgisel kalsifikasyon — kontrastsız kesitlerde duvar boyunca ince kalsifiye çizgiler görülebilir; karakteristik olsa da her olguda bulunmaz.
• Lümen dolum defekti — polipoid birikim veya mukozal düzensizlik mesane idrar sütununa taşabilir.
• Üreterovezikal bileşke komşuluğu — tutulum bu bölgede ise distal üreter duvarı ve üst sistemde genişleme eşlik ediyor mu incelenir.
• Perivezikal uzanım ve lenf düğümleri — infiltratif kenar, yağ planı kaybı veya pelvik adenopati varsa eşlik eden malignite olasılığı ayrıca değerlendirilir; bu bulgular amiloid tanısı koydurmaz.

Normalde

Mesane amiloidozunda BT'de duvar kalınlaşması ve kitle lezyonları görülebilir. Mesane amiloidozunda fokal veya diffüz duvar kalınlaşması ve intramural kalsifikasyon görülebilir.

Ayırıcı tanı

Ürotelyal karsinom

kontrastlanan papiller kitle veya asimetrik duvar kalınlaşması yapar; BT görünümü amiloidozla örtüşebilir ve doku tanısı gerekir.

Enfeksiyöz sistit

komplike alt üriner sistem enfeksiyonlarının BT/MR değerlendirmesinde ele alınan durumlardandır.

Mesane lenfoması

yaygın veya nodüler duvar kitlesi yapabilir; eşlik eden lenfadenopati ve diğer ekstravezikal hastalık alanları ipucudur.

Mesane endometriozisi

çoğunlukla fokal duvar odağıdır; siklik semptomlar ve MR'da kan ürünlerine ait sinyal özellikleri yardımcı olur.

Mesane pıhtısı

lümen içinde duvara yapışmayan dolum defekti oluşturabilir; kontrastlanmaz ve pozisyonla yer değiştirebilir.

Fokal mesane duvarı kalınlaşması amiloidozda görülebilir ve maligniteyi taklit edebilir; BT hastalığı mesane tümörlerinden güvenilir biçimde ayıramaz.

Tuzaklar

• Duvar kalınlaşmasını yalnızca yetersiz distansiyona bağlamayın; iyi dolu komşu kesitlerde aynı fokal nodül sürüyorsa gerçek lezyondur.
• Kalsifikasyon görülmesi tek başına amiloidoz tanısı koşturmaz; schistosomiazis, kronik inflamasyon ve tümörlerde de izlenebilir, kesin tanı için doku örnekleme şarttır.
• BT'de kanserle örtüşen görünüm nedeniyle amiloidoz görüntüleme ile kesinleştirilemez; Congo red boyası ve polarize ışıkta çift kırılma doku tanısını sağlar.

Kendini dene

1. Hematürili hastada mesane BT'sinde kontrastlanan fokal plak kalınlaşması ve duvar içi çizgisel kalsifikasyon var. BT ile hangisi kesinleştirilebilir?

   • Histolojik tanı
   • Lezyonun duvar yerleşimi
   • Amiloid tipi
   • Sistemik tutulum
   Cevabı göster

   Lezyonun duvar yerleşimi. BT lezyonun yerini, şeklini ve yayılımını gösterir; amiloidoz ile ürotelyal tümörü kesin ayıramaz. Amiloid tipi ve sistemik tutulum ayrıca değerlendirilir, kesin lokal tanı histolojiyle konur.

2. Mesane duvarında nodüler kontrastlanan lezyon saptanıyor; idrar sitolojisi negatif. En uygun görüntüleme yorumu hangisidir?

   • Amiloidoz dışlanmıştır
   • Kesin benign kitle
   • Amiloid-karsinom ayrımı yapılamaz
   • Sistit kanıtlanmıştır
   Cevabı göster

   Amiloid-karsinom ayrımı yapılamaz. Amiloidoz ve karsinom BT'de benzer nodüler ya da polipoid görünüm verebilir; negatif sitoloji depo hastalığını doğrulamaz veya tümörü güvenle dışlamaz. Doku örneklemesi ayrımı sağlar.

İlgili konular

• Mesane ürotelyal karsinomu
• Akut sistit

Kaynaklar

Bu sayfadaki 39 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 7 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.