Legionella pnömonisi

Özet

Legionella pnömonisi, ağır sistemik hastalıkla seyredebildiğinden klinik kötüleşme ve hızla genişleyen akciğer tutulumunun fark edilmesi önem taşıyan bakteriyel bir pnömonidir. Göğüs BT'sinde Legionella pnömonisinde buzlu cam opasiteleriyle birlikte keskin sınırlı konsolidasyonlar görülebilir. Görünüm diğer toplum kökenli pnömonilerle örtüştüğü için BT etken tanısı koydurmaz; klinik ve laboratuvarla birlikte yorumlanır. İlk görüntülemedeki bulgular tedaviyle iyileşse bile kısa aralıkta daha geniş loblara yayılabilir; bu nedenle radyografik progresyon klinik iyileşmeden bağımsız olarak izlenmelidir.

Faz ve pencere

Kontrastsız tanısal

Akciğer penceresinde yamalı, segmental veya lober hava boşluğu konsolidasyonu, içindeki hava bronkogramları, komşu buzlu cam alanları ve eşlik eden plevral sıvı görülür. Efüzyonun basit sıvı yoğunluğu etkeni tanımlamaz; bu parankim paterni için kontrast gerekmez.

Önerilen pencereler: Akciğer (G 1500 / M -600), Mediasten (G 350 / M 50).

BT bulguları

• Keskin sınırlı yamalı konsolidasyon — tek veya birden çok segmentte düzensiz hava boşluğu opasitesi.
• Hava bronkogramı — konsolide alan içinde hava ile dolu bronşların dalları görünür kalır.
• Konsolidasyon çevresi buzlu cam — daha hafif alveoler/interstisyel tutulum yoğun opasitenin çevresinde eşlik edebilir.
• Hızla genişleyen lobar tutulum — ilk odak kısa aralıkta aynı lobu veya komşu lobları kaplayabilir; seri görüntü varsa dağılımı karşılaştırın.
• Bilateral ve çok loblu dağılım — tek taraflı başlangıç olsa bile karşı akciğer ve diğer loblar da etkilenebilir.
• Plevral efüzyon — Legionella pnömonisine plevral efüzyon eşlik edebilir.
• Peribronkovasküler yerleşimli konsolidasyon — peribronkovasküler alandan plevraya uzanan yelpaze biçimli konsolidasyon Legionella pnömonisinde görülebilir.

Normalde

Konsolidasyon ve buzlu cam gibi bulguların Legionella'ya özgü olmadığını göz önünde bulundurun; BT, Legionella pnömonisini diğer pnömonilerden veya enfeksiyöz olmayan torasik süreçlerden güvenilir biçimde ayıramayabilir.

Ayırıcı tanı

Pnömokok pnömonisi

homojen lober konsolidasyon yapabilir; hava bronkogramı ve plevral efüzyon Legionella'dan ayırt ettirmez.

Mycoplasma pneumoniae

bronkovasküler kalınlaşma ve sentrilobüler nodüller öne çıkabilir, ancak yamalı konsolidasyon da görülebilir.

İnfluenza veya diğer viral pnömoniler ayırıcı tanıda yer alır; yamalı infiltratlar Legionella pnömonisiyle örtüşebildiğinden BT tek başına ayrım sağlamaz.

Pulmoner ödem, Legionella pnömonisi dahil diğer pnömonilerden BT'de her zaman güvenilir biçimde ayırt edilemeyebilir; torasik görüntüleme bulguları özgül olmayabilir.

Organize pnömonide, enfeksiyona bağlı alveoler hasar sonrasında bilateral yamalı opasiteler görülebilir.

Tuzaklar

• Konsolidasyon ve küçük efüzyon Legionella'ya özgü değildir; BT raporunda etkeni kesinleştiren bir işaret gibi sunmayın.
• İlk görüntülemede tek lobla sınırlı olması sonraki yayılımı dışlamaz; seri çekimler varsa yeni lob tutulumunu ayrı kaydedin.
• Efüzyonun çevresindeki bağımlı kompresif atelektaziyi doğrudan enfeksiyon konsolidasyonu olarak saymayın; sıvı-konsolide akciğer sınırını ve hacim kaybını izleyin.
• İmmün baskılanmış kişide kavite veya nodül görülmesi Legionella'yı tek başına dışlamaz; atipik seyir ve alternatif patojenler klinik olarak araştırılmalıdır.

Kendini dene

1. Ağır ateşli hastada alt lobda hava bronkogramlı konsolidasyon, çevresinde buzlu cam ve küçük efüzyon var. BT etkeni belirler mi?

   • Hayır; Legionella dahil birçok etken benzer görünür
   • Evet; bu görünüm yalnız Legionella'ya özgüdür
   • Evet; efüzyon Mycoplasma'yı kanıtlar
   • Hayır; bu görünüm pulmoner ödemi kanıtlar
   Cevabı göster

   Hayır; Legionella dahil birçok etken benzer görünür. Legionella'da bu kombinasyon tarif edilse de lober konsolidasyon, hava bronkogramı ve küçük efüzyon diğer pnömonilerde de bulunabilir; etken klinik ve laboratuvarla belirlenir. Görüntü ne mikoplazmayı ne de ödemi kanıtlar.

2. Seri BT’de bir lobdaki opasiteye yeni loblarda tutulum eklenmiş. Görüntülemeden hangi sonuç çıkarılabilir?

   • Tutulum çok loblu hale gelmiştir; etken BT ile tek başına belirlenemez
   • Legionella kesinleşir
   • Bakteriyel enfeksiyon dışlanır
   • Opasitelerin tümü atelektazidir
   Cevabı göster

   Tutulum çok loblu hale gelmiştir; etken BT ile tek başına belirlenemez. Seri incelemede yeni lobların tutulması hastalık yayılımını gösterir; bu seyir Legionella pnömonisinde görülebilse de BT ile etken belirlenemez. Atelektazi için hacim kaybı beklenir ve patern tek başına bakteri/virüs ayrımı yaptırmaz.

Kaynaklar

Bu sayfadaki 37 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.