Kaviter akciğer lezyonu: morfoloji ve ayırıcı tanı

Özet

Kavite; akciğer konsolidasyonu, nodülü veya kitlesi içinde görülen, havayla dolu alçak atenüanslı bir boşluktur. BT’de kavite duvarının kalınlığı ile çevresindeki sentrilobüler nodüller ve konsolidasyon gibi bulgular değerlendirilir; bunlar klinik bilgilerle birlikte enfeksiyöz, sistemik ve malign nedenlerin ayırıcı tanısına katkı sağlar. Hava-sıvı seviyesi tek başına apseyi kanıtlamaz; ince duvar da maligniteyi dışlamaz. Apse ve septik emboli gibi süreçlerde lokal ampiyem, bronkoplevral fistül ve plevral effüzyon gibi komplikasyonlar gelişebilir.

Faz ve pencere

Kontrastsız tanısal

BT’de kavite duvar kalınlığı, hava-sıvı seviyesi ve çevresindeki sentrilobüler nodüller ile konsolidasyon değerlendirilebilir.

BT bulguları

• Kavite — konsolidasyon, nodül veya kitle içindeki gaz ya da düşük atenüasyonlu boşluğun çevresinde tanımlanabilir duvar bulunması.
• Duvarın en kalın kesimde ölçülen kalınlığı ile iç yüzün düzgün, lobüle veya düzensiz olması; tek başına kesin benign-malign ayrımı sağlamaz.
• Tek veya çok sayıda kavite; tek lezyonun lobu ve çoklu lezyonların dağılımı ayırıcı tanıyı yönlendirir.
• Kavitede yatay hava-sıvı seviyesi; hava yolu bağlantısı veya sıvı içeriğiyle oluşabilir ve özgül değildir.
• Çevresel sentrilobüler nodül ve tree-in-bud örüntüsü; bronşioler yayılım gösteren enfeksiyonu destekler.
• Kavite çevresinde konsolidasyon, buzlu cam veya nekrotik parankim; enfeksiyon ve kanama eşlik edebilir.
• Komşu bronşun kaviteye açılması, plevral kalınlaşma, plevral sıvı ya da hava-sıvı içeren plevral koleksiyon.

Ölçütler ve sınıflamalar

İnce duvarlı akciğer kisti için tipik duvar

<2 mm

Tek kaviter lezyonlarda benign hastalık için yüksek özgüllüklü duvar kalınlığı

<7 mm

Tek kaviter lezyonlarda malignite için yüksek özgüllüklü duvar kalınlığı

>24 mm

Normalde

Kavite, konsolidasyon, kitle veya nodül içinde görülen gaz dolu ya da düşük atenüasyonlu bir alandır. Kaviteyi değerlendirirken boşluğun konsolidasyon, kitle veya nodül içinde yer alıp almadığını belirle.

Ayırıcı tanı

Akciğer apsesi

nekrotik merkez çevresinde kalın, çoğu kez çevresel kontrastlanan duvar ve komşu konsolidasyon görülür; kontrastlı inceleme istenmişse duvarı değerlendir.

Kavitasyon yapan bronşiyal karsinom

düzensiz, değişken kalınlıkta duvarlı tek kitle olarak ortaya çıkabilir; bronşiyal karsinomların %10-15'i kaviter seyir gösterir.

Tüberküloz

üst loblarda kavite, çevresinde sentrilobüler nodüller ve bronkojenik yayılım bulguları görülebilir.

Septik pulmoner emboli

iki taraflı periferik nodüllerin bir kısmında kavitasyon ve ayrı plevra tabanlı kama opasiteler olabilir.

Granülomatozis ile polianjiit

birden fazla kaviteli nodül, eşlik eden vasküler ve üst hava yolu hastalığı bağlamında değerlendirilir.

Nekrotizan pnömoni ve kronik pulmoner aspergilloz

kaviter görünüm oluşturabilir; dağılım, eşlik eden parankim bulguları ve klinik bağlam ayırıcı tanıya katkı sağlar.

Tuzaklar

• Duvar kalınlığı olasılığı değiştirir fakat eşiklerin dışındaki ince duvarlı karsinomlar ve kalın duvarlı enfeksiyonlar tanımlanmıştır; tek ölçümle benign ya da malign hükmü verme.
• Hava-sıvı seviyesi hem apse hem kaviteli tümör veya bronşla ilişkili diğer boşluklarda görülebilir; çevre konsolidasyon ve duvarın kontrastlanması ayırıcı bağlam sağlar.
• Kaviteyi bül veya kist sanmak, özellikle çok ince duvar ve çevre parankim hastalığı yokluğunda mümkündür; bronş ilişkisini ve eşlik eden fibrotik mimariyi kontrol et.
• Periferal lokalize apselere komşu plevrada kalınlaşma veya ampiyem gelişebilir; bu durum akciğer içi kavite ile karışabilir.

Kendini dene

1. Öksürüğü ve ateşi olan bir hastada, duvarı kalın ve çevresel olarak kontrastlanan, içinde hava-sıvı seviyesi bulunan bir kavite ile komşu konsolidasyon görülüyor. En olası tanı hangisidir?

   • Akciğer apsesi
   • Skuamöz hücreli karsinom
   • Tüberküloz kavitesi
   • Bül
   Cevabı göster

   Akciğer apsesi. Nekrotik merkez çevresinde çevresel duvar kontrastlanması ve komşu konsolidasyon apseyi destekler. Kavite içeriği benign ve malign lezyonları ayırmada genellikle az yardımcıdır; hava-sıvı seviyesi bronkojenik kistlerde ve bazı akciğer adenokarsinomlarında da görülebilir.

2. Bronşiyal karsinomların yaklaşık ne kadarı kaviter özellik gösterir?

   • %5–10
   • %10–15
   • %20–25
   • %30–40
   Cevabı göster

   %10–15. Kaynağa göre bronşiyal karsinomların %10–15'i kaviter özellik gösterir.

İlgili konular

• Skuamöz hücreli akciğer kanseri
• Kavitasyonlu pulmoner metastazlar
• Akciğer apsesi / nekrotik enfeksiyon

Kaynaklar

Bu sayfadaki 38 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 11 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.