Obliteratif bronşiolit

Özet

Obliteratif (konstriktif) bronşiolitte membranöz bronşioller çevresindeki fibrozis lümeni daraltır veya kapatır; transplantasyon, enfeksiyon ya da toksik maruziyet sonrasında gelişebilir. İnspiryum ve ekspirasyon HRCT, yamalı mozaik atenüasyonu ve ekspirasyonda belirginleşen hava hapsini ortaya koyar. İnce kesitli inspiryum ve ekspirasyon BT'lerinde daralmış ve kısmen oblite edilmiş bronşiollerin neden olduğu hava hapsi, yüksek ve düşük yoğunluklu bölgelerin oluşturduğu yamalı mozaik atenüasyon paternini ortaya koyar. Hastalık yama tarzında olduğundan normal görünen alanlar tanıyı dışlamaz; geç bronşektazi ve yapısal hasar gözden kaçabilir.

Faz ve pencere

HRCT tanısal

Kontrastsız inspiryum ve ekspirasyon ince kesitlerinde düşük atenüasyonlu lobüler alanların ekspirasyonda radyolüsent kalması ve yamalı mozaik atenüasyon aranır. Bronşektazi ve bronşiyolektazi ağır skarlaşmanın geç bulgularıdır; nadiren hava hapsine bağlı dinamik akciğer kompresyonuyla restriktif patern görülebilir.

BT bulguları

• Ekspiratuvar hava hapsi — normal akciğer ekspirasyonda yoğunlaşırken etkilenen lobüler alan düşük atenüasyonunu korur.
• Mozaik paternin hava hapsiyle ilişkisini değerlendirmek için inspiryum ve ekspirasyon HRCT görüntüleri birlikte incelenmelidir.
• Parankim yoğunluğunda bölgesel farklılaşma — düşük ve görece yüksek atenüasyonlu alanların yamalı dağılımı ile komşu parankim arasında havalanma farkı belirginleşir.
• Yamalı dağılım — hastalık bulguları tek bir kitle veya homojen bir alana uymadan, komşu parankimde farklı havalanma seviyeleri gösterir.
• Bronşiektazi ve bronşiyolektazi — ağır fibrotik hasarın geç bulguları olarak bronş ve bronşiollerde kalıcı genişleme gelişebilir.
• Bronş duvarı kalınlaşması bronşit ile ilişkilendirilebilir; konstriktif bronşiolitte inspirasyon ve ekspirasyon HRCT'sinde mozaik patern ve hava hapsi bulguları değerlendirilir.
• Solunum fonksiyon testlerinde tipik olarak geri dönüşümsüz hava akımı obstrüksiyonu görülür; nadiren hava hapsine bağlı dinamik akciğer kompresyonuyla restriktif patern izlenebilir.
• Mozaik atenüasyon ve ekspiratuvar hava hapsi küçük hava yolu obstrüksiyonunu destekler, ancak astım gibi başka hastalıklarda da görülebilir; tanı klinik bağlam ve solunum fonksiyon bulgularıyla birlikte değerlendirilir.

Normalde

Ekspiratuvar HRCT'de hava hapsi olan alanlar ile komşu akciğer arasında oluşan yüksek ve düşük atenüasyon farkı mozaik patern olarak görülebilir. Ekspirasyon HRCT, inspiryumda görülen mozaik paternin hava hapsine bağlı olup olmadığını değerlendirmeye yardımcı olur; bulgular klinik bağlam ve solunum fonksiyonlarıyla birlikte yorumlanır.

Ayırıcı tanı

Konstriktif bronşiolitte mozaik atenüasyon, hava hapsine bağlı yüksek ve düşük yoğunluklu alanların yama tarzı dağılımından kaynaklanabilir. Ekspiratuvar HRCT'de hava hapsiyle birlikte görülen mozaik patern konstriktif bronşioliti destekler.

Hipersensitivite pnömonisi

mozaik atenüasyona ek olarak silik sentrilobüler buzlu cam nodülleri ve infiltratif alanlar eşlik edebilir.

Astım veya KOAH

ekspiratuvar hava hapsi görülebilir; klinik obstrüksiyon, bronş duvarı değişikliği ve amfizem eşlik eden bulgularla ayrım yapılır.

Kardiyojenik/interstisyel buzlu cam paterniyle ayırıcı tanının ekspiratuvar özellikleri bu kaynaklarda açıklanmıyor; konstriktif bronşiolitte ekspiratuvar HRCT'deki mozaik patern hava hapsine bağlıdır.

Swyer-James-MacLeod paterni

tek taraflı hiperlüsensi ve küçük damarlar çocukluk enfeksiyonuna bağlı obliteratif bronşiolitin tek akciğer ağırlıklı görünümü olabilir.

Obezite hipoventilasyon sendromuna eşlik eden pulmoner vasküler hastalıkta mozaik atenüasyona periferik pulmoner arter dallarında göreceli azalma eşlik edebilir.

Tuzaklar

• İnspiryumda mozaik atenüasyonu tek başına hava hapsi saymayın; uygun ekspirasyon serisinde düşük atenüasyonlu lobülün radyolüsent kalmasını gösterin.
• Tek fazlı görüntüleme yanıltıcı olabilir; tanı için yalnızca düşük atenüasyon yeterli değildir, ekspirasyonda hava hapsinin varlığı doğrulanmalıdır.
• Yetersiz ekspirasyon incelemesi hava hapsini saklayabilir; trakea arka membranındaki şekil değişikliği ve akciğer hacmindeki azalma ile ekspirasyon yeterliliğini gözden geçirin.
• Yama tarzı hastalıkta normal parankim örneklemesi tanısal değişikliği kaçırabilir; BT bulgusunu klinik ve solunum fonksiyonuyla birlikte yorumlayın.

Kendini dene

1. Ekspirasyonda yamalı düşük atenüasyon korunuyor ve bu lobüllerde hava hapsi belirgin. En uygun patern nedir?

   • Obliteratif bronşiolit
   • Kardiyojenik ödem
   • Lober pnömoni
   • Lenfanjitik karsinomatozis
   Cevabı göster

   Obliteratif bronşiolit. Ekspirasyonda radyolüsent kalan lobüller hava hapsini; yamalı mozaik atenüasyon konstriktif bronşioliti destekler. Lenfanjitik yayılımda interlobüler septal ve peribronkovasküler kalınlaşma görülebilir; pnömonide konsolidatif veya buzlu cam opasiteleri izlenebilir.

2. Mozaik atenüasyonun hava hapsine bağlı olup olmadığını en iyi hangi görüntü çifti gösterir?

   • İnspiryum ve ekspirasyon HRCT
   • Arteriyel ve portal BT
   • Kontrastsız ve gecikmiş BT
   • Kemik ve yumuşak doku algoritması
   Cevabı göster

   İnspiryum ve ekspirasyon HRCT. Hava hapsi ekspirasyonda belirginleşir; normal parankim yoğunlaşırken etkilenen lobül radyolüsent kalır. Diğer faz veya algoritma çiftleri küçük hava yolu ekspirasyon fizyolojisini göstermez.

İlgili konular

• Enfeksiyöz bronşiolit ve tree-in-bud
• Respiratuvar bronşiolit
• Foliküler bronşiolit

Kaynaklar

Bu sayfadaki 39 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 21 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.