Hücresel NSIP

Özet

Hücresel NSIP, NSIP’in histolojik alt tiplerinden biridir; NSIP en sık bağ dokusu hastalıklarıyla ilişkilidir veya ilaç reaksiyonuna bağlı gelişebilir. BT'de iki taraflı buzlu cam ve bazen ince retikülasyon görülebilir; ancak hücresel alt tipin BT ile fibrotik NSIP'ten güvenilir ayrımı yapılamaz. Görüntü inflamasyonun dağılımını ve alternatif tanı işaretlerini ortaya koyar, histolojik alt tipi tek başına kanıtlamaz. Yaygın buzlu camı enfeksiyon, ödem veya akut akciğer hasarı sanmak klinik değerlendirmeyi geciktirebilir; tersine buzlu camı otomatik olarak hücresel NSIP saymak da yanıltıcıdır.

Faz ve pencere

HRCT tanısal

Kontrastsız ince kesit inspiratuvar HRCT'de iki taraflı yamalı veya yaygın buzlu cam opasiteleri, alt zon/posterior ağırlık ve eşlik edebilen ince retikülasyon araştırılır; prone görüntü bağımlı atelektaziyi, ekspirasyon ise hava hapsi eşlik edip etmediğini ayırt etmeye yardımcı olur. Hücresel ve fibrotik alt tipi ayıran özgül bir BT fazı yoktur.

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

BT bulguları

• Bilateral buzlu cam — damar ve bronş konturlarını silmeden akciğer yoğunluğunun artması; yamalı ya da yaygın olabilir.
• Simetrik alt zon dağılımı — iki akciğer alt yarısında benzer yük; tek loba sınırlı enfeksiyon görünümünden ayrılır.
• Posterior-subplevral opasite — sırtüstü incelemede posterior bazal opasiteler bağımlı dağılım gösterebilir; yüzüstü (prone) görüntülerde sürüp sürmediği değerlendirilir.
• İnce retiküler çizgiler — buzlu cam zemininde ince intralobüler çizgilenme eşlik edebilir.
• Sınırlı mimari distorsiyon — hücresel örüntüde belirgin traksiyon bronşektazisi veya hacim kaybı baskın bulgu değildir.
• Subplevral korunma — opasitenin hemen plevra altındaki ince akciğer şeridini görece koruması NSIP lehine ipucu olabilir.
• Eşlik eden hava yolu bulgusu — yaygın belirgin hava hapsi veya sentrilobüler nodüller HP gibi alternatif örüntüleri gündeme getirir.

Normalde

Aynı kesitte sağ-sol alt lobları ve plevra komşuluğunu karşılaştırın; buzlu cam alanının hemen plevra altında görece koruma gösteren ince bir akciğer şeridinin varlığını değerlendirin.

Ayırıcı tanı

Fibrotik NSIP

buzlu cama ek olarak daha belirgin retikülasyon, traksiyon bronşiektazisi ve lob hacim kaybı eşlik eder; alt tip yine yalnız BT ile kesinleştirilemez.

Enfeksiyöz pnömoni

fokal/lober konsolidasyon, hava bronkogramı veya bronşiol merkezli nodüller klinik bağlamla birlikte daha olasıdır.

Akut interstisyel pnömoni/ARDS benzeri BT paterninde pulmoner ödem ayırıcı tanıda yer alır.

Organize pnömoni

periferik veya peribronkovasküler yamalı konsolidasyonlar, hava bronkogramı ve yer değiştiren opasiteler ön plandadır.

Hipersensitivite pnömonisi

sentrilobüler belirsiz nodüller, lobüler mozaik atenüasyon ve ekspiratuvar hava hapsi küçük hava yolu bileşenini gösterir.

Tuzaklar

• Hücresel NSIP histolojik bir alt tiptir; BT'deki buzlu camın tek başına hücresel inflamasyon kanıtı olduğunu söylemeyin.
• İnspirasyon yetersizliği yalancı buzlu cam görünümüne yol açabileceğinden incelemenin inspirasyon yeterliliğini kontrol edin.

Kendini dene

1. İki alt lobda simetrik buzlu cam var; damarlar seçiliyor, belirgin traksiyon ve hacim kaybı yok. Hangi ifade en doğru?

   • NSIP ile uyumlu patern
   • Kesin hücresel NSIP
   • UIP paterni
   • Kardiyojenik ödem
   Cevabı göster

   NSIP ile uyumlu patern. Bu dağılım NSIP ile uyumlu olabilir ancak BT histolojik hücresel alt tipi kanıtlamaz. UIP için fibrotik retikülasyon, traksiyon bronşiektazisi ve tipik alt zon dağılımı aranır; bu bulguların varlığı BT'de güvenilir UIP tanısını destekler.

2. HRCT'te bal peteği (honeycombing) yapısı nasıl tanımlanır?

   • Plevra tabanında üst üste dizilmiş iyi sınırlı kistik boşluklar
   • Sentrilobüler belirsiz nodüllerle birlikte mozaik atenüasyon
   • Merkezi buzlu cam etrafında >2mm konsolidasyon halkası
   • Yaygın düzgün septal kalınlaşma ve plevral sıvı
   Cevabı göster

   Plevra tabanında üst üste dizilmiş iyi sınırlı kistik boşluklar. S1'e göre bal peteği, plevra altı tabanda üst üste dizilmiş, iyi sınırlı duvarlı kistik boşluklardan oluşur ve güvenilir UIP tanısının kritik bileşenidir.

İlgili konular

• Fibrotik NSIP

Kaynaklar

Bu sayfadaki 32 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 8 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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