Mycoplasma pneumoniae pnömonisi BT bulguları

Özet

Mycoplasma pneumoniae pnömonisi, özellikle okul çağındaki çocuklar ve genç erişkinlerde görülen, görüntülemede değişken küçük hava yolu ve hava boşluğu tutulumuna yol açan bir enfeksiyondur. Kontrastsız ince kesit BT, bronşiolit nodüllerini ve yamalı lobüler buzlu cam/konsolidasyonu akciğer grafisinden daha iyi ortaya çıkarır. Bronş çevresi kalınlaşma ve sentrilobüler nodüller etkeni düşündürebilir, ancak hiçbir patern mikoplazmaya özgü değildir. Konsolidasyonun yaygınlığı ve plevral eşlikçiler gözden kaçarsa klinik şiddet ve alternatif tanılar eksik değerlendirilir.

Faz ve pencere

Kontrastsız tanısal: Akciğer algoritmalı ince kesit aksiyel ve koronal görüntülerde bronkovasküler demet ve bronş duvarı kalınlaşması, bulanık sentrilobüler nodüller/tomurcuklanan ağaç, lobüler buzlu cam ve hava bronkogramlı konsolidasyon seçilir; varsa hava hapsi ekspirasyon görüntülerinde belirginleşir. Dağılım tek lobdan iki taraflı çok odaklı tutuluma kadar değişebilir; kontrast gerekmez.

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

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

BT bulguları

Bronkovasküler demet kalınlaşması — bronş ve eşlik eden arter çevresinde belirginleşen peribronşiyal/perivasküler interstisyel opasite.
Sentrilobüler nodüller — terminal bronşiol çevresinde bulanık küçük nodüller, yer yer dallanan tomurcuklanan ağaç görünümü.
Lobüler buzlu cam — damar ve bronş sınırları korunurken lobüler alanı örten hafif opasite artışı.
Yamalı hava boşluğu konsolidasyonu — segment veya lobül ölçeğinde yoğun opasite; içinden geçen bronşlar hava bronkogramı oluşturabilir.
Değişken tek/çok lob tutulumu — alt lob baskın olabilir ancak yerleşim etkeni kanıtlayan sabit bir patern değildir.
Küçük plevral efüzyon — eşlik edebilir ve BT'de grafiye göre daha kolay seçilebilir.
Mozaik atenüasyon — bronşiolit veya hava yolu daralmasına eşlik edebilir; ekspirasyon görüntüleri varsa hava hapsiyle desteklenir.

Normalde

Aynı lob düzeyinde karşı tarafla kıyaslayarak bronş duvarı kalınlığını, merkezinde küçük damar bulunan bulanık nodülleri ve damar kenarlarını silmeden yoğunluğu artıran lobüler buzlu camı arayın.

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

Viral bronşiolit/pnömoni: benzer sentrilobüler nodül ve bronş duvarı kalınlaşması yapabilir; yaygınlık ve klinik bağlam örtüşür, BT etkeni ayırmaz.
Bakteriyel bronkopnömoni: daha yoğun bronş merkezli veya segmental konsolidasyon ve eşlik eden tomurcuklanan ağaç görülebilir.
Tüberküloz: üst lob kavitesi, nekrotik lenf düğümü veya kronik yayılım eşlik edebilir; erken bronşiolit bulguları örtüşebilir.
Organize pnömoni: Mycoplasma pneumoniae pnömonisinin iyileşme döneminde alveol kanallarını dolduran granülasyon dokusu görülebilir.

Tuzaklar

Bronş duvarı kalınlaşması ve tomurcuklanan ağaç Mycoplasma için tek başına özgül değildir; viral ve diğer bakteriyel bronşiolitlerde de görülür.
Konsolidasyon tek loba sınırlı olduğunda tipik olmayan görünüm diye mikoplazmayı dışlamayın; BT dağılımı geniş değişkenlik gösterir.
Hava bronkogramını bronşektazi olarak adlandırmayın; kalıcı bronş genişlemesini değerlendirmek için bronş çapını eşlik eden arterle karşılaştırın.
Mozaik patern, Mycoplasma pneumoniae pnömonisinde BT ile tanımlanan görüntüleme sınıflarından biridir.

Kendini dene

Mycoplasma pneumoniae pnömonisinde küçük hava yollarındaki hücresel bronşit BT'de hangi bulguyla ilişkilidir?
Cevabı göster
Sentrilobüler nodüller. Küçük hava yollarındaki hücresel bronşit, BT'de sentrilobüler nodüllerle ilişkilidir.
Sentrilobüler nodüller, Mycoplasma pneumoniae pnömonisinde hangi küçük hava yolu bulgusuyla ilişkilidir?
Cevabı göster
Enfeksiyöz bronşiolit. Sentrilobüler nodüller küçük hava yollarındaki hücresel bronşit ile ilişkilidir; bronş duvarı kalınlaşması da görülebilir. İnterlobüler septal kalınlaşma pulmoner ödemde veya tümörlerin lenfanjitik yayılımında görülebilir.

Kaynaklar

Bu sayfadaki 33 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 14 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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