Sitomegalovirüs pnömonisi BT bulguları

Özet

Sitomegalovirüs (CMV) pnömonisi, immün sistemi baskılanmış kişilerde görülebilen fırsatçı bir akciğer enfeksiyonudur. İnce kesit BT, CMV pnömonisinde genellikle bilateral buzlu cam alanları, küçük nodüller ve konsolidasyon gösterir; radyografide de benzer bulgular izlenebilir ancak özgül değildir. Bu örüntü CMV'ye özgü değildir ve başka fırsatçı enfeksiyonlarla birlikte bulunabilir; görüntüleme mikrobiyolojik tanının yerine geçmez. İmmünsüprese hastada yaygın tutulumun veya eş enfeksiyonun gözden kaçması hastalık şiddetinin eksik değerlendirilmesine yol açabilir.

Faz ve pencere

HRCT: Kontrastsız yüksek çözünürlüklü BT'de iki akciğerde yamalı veya yaygın buzlu cam alanları, lobüler merkezli küçük nodüller, yer yer konsolidasyon ve interstisyel kalınlaşma izlenir. Bu parankimal örüntü için intravenöz kontrast gerekmez.

Önerilen pencereler G genişlik, M merkez; değerler Hounsfield birimi (HU)

AkciğerG 1500 / M −600
MediastenG 350 / M +50

BT bulguları

Bilateral buzlu cam opasiteleri — yamalı veya yaygın olabilir; tek başına CMV'yi kanıtlamaz.
Belirsiz sentrilobüler nodüller — özellikle buzlu camla birlikte küçük hava yolu çevresinde görülür.
Hava boşluğu konsolidasyonu — buzlu cam alanlarına eklenebilir, yamalı veya daha geniş dağılım gösterebilir.
CMV pnömonisi şüphesinde buzlu cam opasitelerine interlobüler septal kalınlaşma eşlik edebilir; bu bulgu tek başına özgül değildir.
Asimetrik dağılım — iki taraflı tutulum eşit yoğunlukta olmayabilir ve segmental yamalar şeklinde uzanabilir.
CMV pnömonisinde plevral efüzyon görülebilir; BT bulguları genellikle özgül değildir ve diğer viral pnömonilerle örtüşebilir.
Eşzamanlı fırsatçı enfeksiyon örüntüsü — nodül, kavite veya farklı dağılımdaki opasiteler ikinci bir etken olasılığını gündeme getirir.

Normalde

Normal akciğerde ikincil lobüllerin havalı zemininde buzlu cam yoğunluğu, belirsiz sentrilobüler nodüller veya interlobüler septal çizgilenme görülmez; damarlar düzenli dallanır. Karşı akciğerin eş düzeyindeki loblarını kıyaslayarak opasitenin yamalı dağılımını, nodüllerin bronşiol merkezli olup olmadığını ve septaların seçilir hale gelip gelmediğini değerlendirin.

Normal BT ile kıyasla

Aynı bölgenin, kaynak veri setinde patoloji içermediği belirtilen bir BT incelemesini kesit kesit kaydırın; organ sınırlarını açarak anatomiyi hasta görüntüsüyle karşılaştırın. Küçük rastlantısal bulgular tümüyle dışlanmamıştır.

Kaynak: TotalSegmentator v2.01 veri seti (Wasserthal ve ark., Radiology: Artificial Intelligence 2023), CC BY 4.0, vaka s1278; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Pneumocystis jirovecii pnömonisi: yaygın iki taraflı buzlu cam yapabilir; kist/pnömotoraks eşliği ve klinik mikrobiyoloji ayrımda önemlidir.
İlaç ilişkili pnömonit: buzlu cam, organize konsolidasyon veya kaldırım taşı görünümü yapabilir; yeni ilaç ve tedavi zamanlaması araştırılır.
Akut pulmoner ödem: immunosuprese hastalarda ayırıcı tanıya dahil edilmelidir.
İnfluenza veya diğer viral pnömoniler: bilateral buzlu cam ve yamalı konsolidasyon örtüşür; etken radyolojik görünümle güvenilir biçimde ayrılamaz.
Diffüz alveoler kanama: yamalı/yaygın buzlu cam ve konsolidasyon oluşturur; hemoglobin düşüşü ve hemoptizi gibi klinik veriler gerekir.
Pneumocystis, invaziv fungal ve diğer viral pnömonilerde de buzlu cam opasiteleri veya nodüller görülebilir; görüntüleme örüntüleri örtüşebildiğinden ayırım klinik ve mikrobiyolojik bulgularla birlikte yapılmalıdır.

Tuzaklar

Buzlu cam, küçük nodül ve konsolidasyon birlikteliği CMV'ye özgü değildir; radyolojiyle etken türü tayin etmeyin.
Nakil alıcısında akciğerde CMV saptanması tek başına CMV pnömonisi anlamına gelmez; doku hastalığı veya klinik olarak anlamlı alt solunum yolu kanıtı gerekir.
Başka fırsatçı enfeksiyon CMV ile eşzamanlı olabilir; tüm opasiteleri tek patojene bağlamadan farklı dağılım ve kaviteyi ayrıca arayın.
Göğüs grafisi ve BT bulguları CMV pnömonisinde özgül olmayabilir; klinik gereklilik halinde yüksek çözünürlüklü BT parankim bulgularını daha ayrıntılı değerlendirmeye yardımcı olabilir.

Kendini dene

Nakil alıcısında bilateral yamalı buzlu cam, belirsiz sentrilobüler nodüller ve septal kalınlaşma var. Bu örüntünün CMV ile ilişkisi için en doğru ifade hangisidir?
Cevabı göster
CMV pnömonisiyle uyumludur, ancak özgül değildir. Bu bulgular nakil alıcılarında CMV pnömonisinde tarif edilmiştir, ancak başka fırsatçı enfeksiyonlar ve eş enfeksiyonlar da benzer görünebilir; BT tek başına etkeni kanıtlamaz.
BT'de iki taraflı buzlu cam ve küçük nodüller görülmesi CMV tanısını nasıl etkiler?
Cevabı göster
Olasılığı destekler, kanıtlamaz. Bu görünüm CMV pnömonisiyle uyumludur fakat viral, fungal, ilaç ilişkili ve diğer süreçlerle örtüşür. Etkenin ve klinik pnömoninin doğrulanması için uygun mikrobiyolojik/doku verisi gerekir.

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 9 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.