Özet
Pulmoner amiloidoz, akciğerde anormal protein birikiminin nodül, hava yolu duvarı veya alveoler septa ağırlıklı görünümler oluşturduğu nadir bir hastalıktır; tutulum lokal kalabilir ya da sistemik amiloidozun parçası olabilir. BT nodüler, diffüz alveoler-septal ve trakeobronşiyal örüntüleri ve hastalığın yayılımını gösterebilir; trakeobronşiyal tutulum hava yolu darlığına yol açabilir, amiloid tipinin belirlenmesi için doku örneği ve immünohistokimyasal inceleme gerekir. Özellikle kalsifiye nodüller maligniteyi dışlamaz, bronş duvarındaki kalınlaşma ise distal akciğer değişikliklerinin sebebini açıklayabilir. Hava yolu daralmasının fark edilmemesi tekrarlayan enfeksiyon veya atelektazinin altında yatan nedeni gizleyebilir.
Faz ve pencere
- HRCT tanısal
- BT’de periferik nodüller, trakea duvarında kalınlaşma ve diffüz tutulumda buzlu cam opasiteleri ile interlobüler septal kalınlaşma araştırılır.
Önerilen pencereler: Akciğer (G 1500 / M -600), Mediasten (G 350 / M 50).
BT bulguları
- Periferik nodüler birikim — iyi sınırlı tek veya çoklu parankim nodülleri plevraya yakın yerleşebilir; bazı nodüllerde noktasal ya da kaba kalsiyum bulunur.
- Trakeobronşiyal plaklar — submukozal birikim trakea ve büyük bronş duvarında yamalı, nodüler veya düzgün çevresel kalınlık oluşturabilir.
- Hava yolu kalsifikasyonu — duvar içi kalsifik odaklar mediasten penceresinde seçilir ve kıkırdak halkalardan bağımsız dağılım gösterebilir.
- Bronş lümeni daralması — duvar birikimi lümeni düzensizleştirip daraltabilir; tıkanıklık distalinde hava hapsi veya atelektazi gelişebilir.
- Alveoler-septal örüntü — interlobüler septalarda ve interstisyumda kalınlaşma, ince retikülasyon ve buzlu cam alanları birlikte görülebilir.
- Komşu subplevral mikronodüller — diffüz septal süreçte küçük periferal nodüller retiküler alanlara eşlik edebilir.
- Kistik eşlik — özellikle lenfositik interstisyel pnömoniyle birlikte ince duvarlı kistler nodüler amiloid birikimine eşlik edebilir.
- Çok kompartımanlı hastalık — bronş duvarı, parankimal nodül ve septal tutulum tek hastada birlikte bulunabilir.
Ölçütler ve sınıflamalar
- Nodüler parankimal tutulum
- Bir veya çok sayıda periferik, iyi sınırlı nodül baskındır; kalsifikasyon bulunabilir.
- Trakeobronşiyal tutulum
- Trakea ve bronş duvarındaki birikim plak, nodül veya çevresel kalınlaşma biçimindedir; lümen daralması eşlik edebilir.
- Diffüz alveoler-septal tutulum
- İnterstisyum ve küçük damar çevresindeki birikim retiküler opasiteler, septal kalınlaşma ve buzlu cam oluşturabilir.
Normalde
Normal trakea ve ana bronşların duvarı ince, konturu düzgün ve hava sütunu açıktır; akciğer parankiminde belirgin septal çizgiler, yaygın nodül veya buzlu cam bulunmaz. Mediasten penceresinde duvar kalınlaşması ile lümen içi lezyon ayrımı değerlendirilebilir ve hastalarda distal parankim değişiklikleri saptanabilir.
Normal BT ile kıyasla
Aynı bölgenin, kaynak veri setinde patoloji içermediği belirtilen bir BT incelemesini kesit kesit kaydırın; organ sınırlarını açarak anatomiyi hasta görüntüsüyle karşılaştırın. Küçük rastlantısal bulgular tümüyle dışlanmamıştır.
Kaynak: TotalSegmentator v2.01 veri seti (Wasserthal ve ark., Radiology: Artificial Intelligence 2023), CC BY 4.0, vaka s1278; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.
Ayırıcı tanı
- Kalsifiye metastatik nodüller
- bazı müsinöz veya kemik oluşturan primer tümörlerden yayılımda nodül kalsifiye olabilir; bilinen malignite ve dağılım ipuçları önemlidir.
- Granülomatöz enfeksiyon sekeli
- eski enfeksiyon da kalsifiye parankimal odaklar bırakabilir; aktif enfeksiyon lehine kavite, tomurcuklu dal veya nekrotik düğüm aranır.
- Trakeobronkopati osteokondroplastika
- kemik-kıkırdak nodülleri çoğunlukla ön ve yan trakea duvarındadır, arka membranöz duvarı koruma eğilimindedir.
- Relapsing polikondrit
- kıkırdak halkalarda kalınlaşma ve kalsifikasyon yapabilir; posterior membranöz yüz genellikle korunur ve klinik kıkırdak inflamasyonu eşlik edebilir.
- Lenfositik interstisyel pnömoni
- buzlu cam, retikülasyon ve kistler oluşturabilir; Sjögren bağlamı ve eşlik eden amiloid nodülleri ayrımı destekler.
Tuzaklar
- Kalsifiye nodül tek başına amiloidoz kanıtı değildir; eski enfeksiyon ve bazı metastazlar da benzer yoğunluk verir.
- Trakeobronşiyal amiloidozda arka membranöz duvar korunumu görülebilir; bu özellik tek başına amiloidoz tanısını doğrulamaz.
- Küçük lümenli bronşlardaki tıkanma tek kesitte fark edilmeyebilir; hava yolu boyunca takip edip distal lobüler havalanmayı kontrol edin.
- Diffüz septal kalınlaşma özgül değildir; BT amiloid örüntüsünü düşündürür, kesin sınıflama histopatoloji ve klinik korelasyon gerektirir.
Kendini dene
BT'de ana hava yollarında kalsifiye duvar birikimi lümeni daraltıyor ve distal akciğerde tekrarlayan kollaps alanları var. Hangi hastalık en olasıdır?
Cevabı göster
Pulmoner AL amiloidoz. Duvar boyunca yaygın kalsifiye submukozal birikim, hava yolu darlığıyla birlikte amiloid tutulumunu düşündürür. Diğer endobronşiyal süreçler genellikle fokal lezyonlar oluştururken; yaygın duvar kalsifikasyonu ve daralma amiloidozun karakteristik özelliğidir.
Akciğer kenarlarında kalsifiye olabilen nodüllerin yanı sıra septal retikülasyon ve buzlu cam alanları bulunuyor. Hangi depo hastalığı bu çoklu örüntüyü açıklayabilir?
Cevabı göster
Pulmoner amiloidoz. Amiloidoz nodüler parankimal ve diffüz alveoler-septal görünümleri aynı hastada oluşturabilir. Amiloidoz nodüler parankimal ve diffüz alveoler-septal görünümleri aynı hastada oluşturabilir; bu kombinasyon diğer deposyon hastalıklarıyla ayırt edilmelidir.
İlgili konular
Kaynaklar
Bu sayfadaki 43 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 8 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.