Yuvarlak pnömoni

Özet

Yuvarlak pnömoni, özellikle çocuklarda görülen ve fokal, yuvarlak ya da oval hava boşluğu konsolidasyonu nedeniyle akciğer kitlesine benzeyen enfeksiyon örüntüsüdür. Tipik çocuk olgusunda klinik ve akciğer grafisi tanı için yeterliyse BT rutin ilk inceleme değildir; BT atipik görünüm, komplikasyon veya alternatif tanı sorusunda kullanılır. BT kesitleri seçilmiş olguda hava bronkogramlarını ve lezyonun çevre akciğerle ilişkisini gösterir. Erişkinde görünüm seyrek olduğundan malignite ayırıcı tanısı önemlidir. Lezyonu doğrudan tümör saymak gereksiz invaziv işleme, enfeksiyon varsayarak kalıcı opasiteyi göz ardı etmek ise tanı gecikmesine yol açabilir.

Faz ve pencere

Kontrastsız tanısal

BT'de yuvarlak pnömoni, yuvarlak veya oval yoğunluk artışı şeklinde görülebilir. Bir erişkin olgu bildiriminde toraks BT incelemesi intravenöz kontrast kullanılmadan yapılmıştır.

BT bulguları

• Yuvarlak veya oval fokal opasite — kitleyi taklit edebilen, çoğu kez tek odaklı konsolidasyon şeklinde görülebilir.
• Erişkin yuvarlak pnömoni olgularında BT’de hava bronkogramı görülebilir. Hava bronkogramı tek başına tanı koydurmaz.
• Plevra ile temas — periferik yerleşim ve plevraya geniş tabanla dayanma görülebilir.
• Çevresel buzlu cam — yuvarlak pnömoni odağının çevresinde buzlu cam opasitesi eşlik edebilir.
• Yuvarlak pnömoni nonsegmental dağılım gösterebilir; BT’de lezyonun segmentlerle ilişkisini değerlendirin.
• Çocuklarda yuvarlak pnömoni çoğunlukla akciğer grafisinde saptanır; tipik klinik ve grafi bulguları varsa BT genellikle gerekli değildir.

Normalde

Yuvarlak pnömoni kitle benzeri opasite oluşturabilir; hava bronkogramı görülse de maligniteden ayırmaya tek başına yardımcı olmaz.

Ayırıcı tanı

Primer akciğer kanserinde spikülasyon, lobülasyon ve plevral indentasyon daha sık görülebilir.

Yuvarlak atelektazi gibi plevral kökenli lezyonlar, kitle benzeri opasitelerle karışabilir.

Akciğer apsesi gibi nekrotik enfeksiyonlar, kavite oluşumu ve çevre parankim tutulumu ile karakterizedir.

Organize pnömoni gibi inflamatuar süreçler, periferik konsolidasyon ve dinamik odaklanma eğilimi gösterebilir.

Pulmoner infarkt, yuvarlak pnömoniye benzeyen üçgen ve plevra tabanlı opasiteyle görülebilir.

Konjenital kistik akciğer lezyonu

çocuklarda kistik konjenital lezyon veya enfekte pulmoner malformasyon yuvarlak opasiteye yol açabilir; tedaviye yanıt yoksa ya da opasite kalıcıysa bu olasılık değerlendirilir.

Tuzaklar

• Hava bronkogramı erişkin yuvarlak pnömoni olgularının BT incelemelerinde her zaman görülmez; malign nodüllerde de görülebildiğinden tek başına ayırıcı değildir.
• FDG tutulumu enfeksiyon ve malignitede örtüşebilir; PET görünümünü tek başına ayırıcı ölçüt kabul etmeyin.
• Ateş veya öksürük eşlik etse de opasite kalıcıysa ya da bronşta kesilme varsa, obstrüksiyon ve malignite olasılığını dışlamadan tanıyı kesinleştirmeyin.
• Çocuklarda posterior ve alt lob yerleşimi sık bildirilirken, erişkin olgularda üst, alt ve orta lob yerleşimleri bildirilmiştir; çocuklardaki dağılım erişkinlere genellenmemelidir.
• Uygun tedavi sonrası klinik ve radyografik gerileme tanıyı destekler; opasite gerilemezse veya klinik-radyolojik bulgular uyumsuzsa alternatif tanılar ve altta yatan lezyon açısından yeniden değerlendirin.

Kendini dene

1. Ateş ve öksürüğü olan çocukta akciğer grafisinde yuvarlak opasiteler görülüyor. Alt solunum yolu enfeksiyonu bulguları olan çocukta yuvarlak opasite görülürse en olası tanı nedir?

   • Yuvarlak pnömoni
   • Akciğer hamartomu
   • Yuvarlak atelektazi
   • Pulmoner infarkt
   Cevabı göster

   Yuvarlak pnömoni. Yuvarlak opasiteyle birlikte enfeksiyon belirtileri yuvarlak pnömoniyi düşündürür; hava bronkogramı tek başına yuvarlak pnömoniyi maligniteden ayırmaz. Pulmoner infarkt, üçgen plevra tabanlı opasiteyle karışabilir.

2. Yuvarlak pnömoni, üçgen plevra tabanlı opasite nedeniyle hangi tanıyla karıştırılabilir?

   • Pulmoner infarkt
   • Yuvarlak atelektazi
   • Akciğer apsesi
   • Organize pnömoni
   Cevabı göster

   Pulmoner infarkt. Yuvarlak pnömoni, üçgen plevra tabanlı yoğunluk nedeniyle pulmoner infarktı taklit edebilir.

İlgili konular

• Atelektazi
• Postobstrüktif pnömoni ve bronş tıkanıklığı
• Kaviteli akciğer kanseri

Kaynaklar

Bu sayfadaki 39 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 25 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.