Fibrotik NSIP

Özet

Fibrotik NSIP, interstisyel inflamasyonla birlikte yaygın fibrozisin bulunduğu ve sıklıkla bağ dokusu hastalıklarıyla ilişkili bir örüntüdür. HRCT alt lob ağırlıklı simetrik retikülasyon, buzlu cam ve traksiyon bronşiektazisini göstererek UIP'den ayrımda katkı sağlar; ancak tek bir işaret tanıyı kesinleştirmez. Görece subplevral korunma ve bal peteğinin azlığı NSIP lehine olabilir, fakat her hastada görülmez. UIP ile karışması etiyolojik sınıflamayı, izlem yorumunu ve multidisipliner tanıyı etkileyebilir.

Faz ve pencere

HRCT tanısal

İntravenöz kontrast gerekmeyen ince kesit inspiratuvar HRCT'de alt loblarda simetrik ince retikülasyon, yaygın buzlu cam, traksiyon bronşiektazisi ve görece subplevral korunma değerlendirilir.

Önerilen pencereler: Akciğer (G 1500 / M -600).

BT bulguları

• Alt zon retikülasyonu — iki akciğer alt loblarında daha belirgin ince intralobüler çizgiler.
• Bilateral simetri — benzer fibrotik yük ve dağılımın iki tarafta görülmesi.
• Buzlu cam bileşeni — retiküler alanlarla eşlik eden, parankimal yoğunluk artışını yansıtan bulgu.
• Traksiyon bronşiektazisi — çevre fibrozisinin çektiği, normalden geniş ve düzensiz bronşlar.
• Subplevral korunma — en periferdeki ince akciğer şeridinin, daha içteki retikülasyona göre daha az etkilenmesi.
• Alt lob hacim kaybı — fissür/yapıların yukarı çekilmesi ve posterobazal akciğer yüksekliğinin azalması.
• Bal peteğinin sınırlı olması — belirgin, çok katlı subplevral kistik kümelerin UIP'den daha az baskın olması.

Normalde

Normal akciğerde interlobüler septal kalınlaşma, retiküler ağ, traksiyon bronşiektazisi veya bal peteği gibi fibrotik bulgular bulunmaz. Alt loblarda plevradan merkeze doğru ilerlerken görece korunmuş ince subplevral şeridin varlığı NSIP lehine özgül bir bulgu iken, fibrotik zeminde traksiyon bronşiektazisi de değerlendirilir.

Ayırıcı tanı

UIP

daha belirgin periferik/bazal retikülasyon ve gerçek bal peteği; düzgün simetrik buzlu cam ve subplevral korunma daha az tipiktir.

Fibrotik hipersensitivite pnömonisi

lobüler hava hapsi, üç yoğunluk görünümü veya belirsiz sentrilobüler nodüller fibrozise eşlik edebilir.

Organize pnömoni

konsolidasyon ve perilobüler bantlar baskındır; kronik olguda fibrotik çizgiler gelişebilse de tipik NSIP dağılımı beklenmez.

İlaç kaynaklı interstisyel hastalık

bazı NSIP olguları ilaç reaksiyonunun sekeli olarak gelişebilir ve bu durumun ayırt edilmesi için ilaç öyküsü değerlidir.

Ödem / ARDS

düzgün septal kalınlaşma ve sık eşlik eden plevral sıvı ile karakterizedir; fibrotik traksiyon bulgularından farklıdır.

Tuzaklar

• Subplevral korunmanın yokluğu NSIP tanısını dışlamaz; alt loblarda simetrik tutulum, traksiyon bronşiektazisi ve diğer örüntü bulguları bütünüyle değerlendirilmelidir.
• Buzlu camı saf inflamasyon kabul etmeyin: retikülasyon ve traksiyonla aynı alanda ise ince fibrozis de katkıda bulunabilir.
• Merkezde bronşla bağlantısı olmayan kistik yapılar bal peteği değil, emfizem kistikleri olabilir; bunlar UIP bulgularıyla birlikte görülebilir ve bal peteğiyle karıştırılmamalıdır.

Kendini dene

1. Alt loblarda simetrik retikülasyon, buzlu cam, traksiyon bronşiektazisi ve ince subplevral korunma var. En uygun örüntü hangisi?

   • Fibrotik NSIP
   • UIP
   • Fibrotik HP
   • Pulmoner ödem
   Cevabı göster

   Fibrotik NSIP. Simetrik alt zon tutulumu, buzlu cam ve olası subplevral korunma fibrotik NSIP'yi destekler. UIP'de periferik bal peteği daha tipiktir; HP için küçük hava yolu bulguları aranır; ödemde plevral sıvı ve damar/septal işaretler beklenir.

2. Retikülasyon ve traksiyonla birlikte belirgin lobüler hava hapsi ve üç farklı atenüasyon alanı var. Hangi tanı öne çıkar?

   • Fibrotik HP
   • Fibrotik NSIP
   • UIP
   • Organize pnömoni
   Cevabı göster

   Fibrotik HP. Retikülasyon ve traksiyon fibrozis bulgularıdır; fibrotik HP, fibrotik NSIP ve UIP’de görülebilir ve tek başına ayrım yaptırmaz. Fibrozise eşlik eden belirgin lobüler hava hapsi ile üç yoğunluk görünümü (farklı atenüasyon alanlarının birlikteliği), küçük hava yolu tutulumu bağlamında fibrotik HP’yi destekler; hava hapsi tek başına özgül değildir. UIP’de subplevral-bazal dağılım ve bal peteği daha tipiktir; fibrotik NSIP’de simetrik bazal tutulum ve bazen subplevral korunma görülebilir. Organize pnömoni örüntüsünde konsolidasyon ve perilobüler opasiteler ön planda olabilir.

Bu konunun yer aldığı turlar

• İnterstisyel akciğer hastalığı paternleri

İlgili konular

• İdiyopatik pulmoner fibrozis ve UIP paterni
• Retikülasyon ve bal peteği: fibrozis paternleri

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 9 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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