Diffüz aksonal yaralanma şüphesi

Özet

Hızlı ivmelenme-yavaşlama veya rotasyonel kafa travmasından sonra bilinç etkilenmesi belirgin olup BT'deki yapısal hasar sınırlı kalan çocukta travmatik aksonal yaralanma düşünülür. Kontrastsız BT makrokanamayı ve büyük ödemi saptayabilir, ancak küçük hemorajik odaklara ve özellikle kanamasız akson hasarına duyarlılığı düşüktür. Gri-beyaz bileşke, korpus kallozum ve dorsolateral beyin sapı incelemeye değer başlıca bölgelerdir. BT'nin hafif görünmesi klinik hasarın hafif olduğunu kanıtlamaz; duyarlılığı daha yüksek MR ile ek değerlendirme gerekebilir.

Faz ve pencere

Kontrastsız tanısal

Gri-beyaz bileşkede, derin beyaz cevherde, korpus kallozumda veya beyin sapında küçük noktasal yüksek atenüasyonlu mikrokanamalar ve yaygın şişme görülebilir; pek çok aksonal odak BT'de seçilmez. Konvansiyonel kontrastlı BT, mikroskobik aksonal hasarı değerlendirmek için tanısal değer taşımaz; bunun yerine MR'nin spesifik sekansları tercih edilir.

Önerilen pencereler: Beyin (G 80 / M 40).

BT bulguları

• Gri-beyaz bileşke mikrokanaması — özellikle frontotemporal subkortikal beyaz cevherde küçük, yuvarlak yüksek atenüasyon odağı.
• Parasagittal beyaz cevher odağı — korteks altına yakın, birden fazla lobda dağınık travmatik kanama noktaları.
• Korpus kallozum odağı — gövde veya splenium içinde fokal hiperdens kanama ya da nadiren düşük atenüasyon.
• Beyin sapında fokal hemorajik odaklar — pontin, mezensefalik veya serebellar pedunkül bölgelerinde SWI ile tespit edilebilen mikrokanamalar.
• Yaygın serebral şişme — bilateral sulkus silinmesi ve gri-beyaz ayrımında azalma; aksonal hasarla birlikte olabilir.
• BT-klinik uyumsuzluğu — belirgin bilinç bozukluğuna karşın büyük kitle, kanama veya kontüzyon görülmemesi; negatif BT akson hasarını dışlamaz.

Ölçütler ve sınıflamalar

Adams travmatik aksonal yaralanma dereceleri

Adams ve arkadaşlarının travmatik aksonal yaralanma derecelendirmesi, bu yaralanma için tanımlanmış derecelendirme sistemlerinden biridir. Bu sınıflandırma histolojik temellidir; görüntüleme bulguları ile patolojik evrelemeyi tam olarak eşleştirmek zordur.

Normalde

Aynı anatomik seviyede gri-beyaz geçişi, splenium iç yoğunluğunu ve beyin sapının dorsolateral kenarlarını kıyaslayarak küçük tek taraflı odakları seçin.

Ayırıcı tanı

Travmatik kontüzyon

kortikal yüzey ve komşu giruslarda yamalı kanama/ödem; aksonal odaklar daha derin beyaz cevherde dağınıktır.

Hemorajik embolik veya vasküler odaklar

arteriyel dağılım, damar anomalisi veya klinik vasküler bağlam gösterebilir; travma odaklarının tipik yerleşimi olmayabilir.

Hipoksik-iskemik hasar

simetrik derin gri çekirdekler veya sınır bölgesi etkilenimi öne çıkabilir; difüzyon MR ayırıcıdır.

Kronik kalsifikasyonlar genellikle simetrik yerleşimli hiperdensiterdir; konvansiyonel BT'de akut kanamadan ayrımı DECT ile kolaylaşır, travmatik mikrokanama ile karıştırılmamalıdır.

Kavernom

iyi sınırlı, kronik kan ürünleri içeren odak; MR'da hemosiderin halkası gösterir.

Tuzaklar

• Normal BT'yi aksonal yaralanma yokluğu sayma; mikroskobik ve kanamasız lezyonlar BT'de görünmeyebilir.
• Küçük odakları yalnız frontal ve temporal konveksitede arama; korpus kallozum ve üst beyin sapı da taranmalıdır.
• Görüntüleme bulgularından yola çıkarak Adams derecesini kesin patolojik evre olarak bildirmekten kaçının; görüntüleme ile histolojik sınıflandırma arasındaki korelasyon sınırlıdır.
• Koroid pleksus kalsifikasyonu ile travmatik kanama ayrımında konvansiyonel BT belirsiz kalabilir; DEBT intrakraniyal kanama ile kalsifikasyonu ayırt etme doğruluğunu artırabilir.

Kendini dene

1. Rotasyonel travmadan sonra BT'de gri-beyaz bileşkede küçük odak ve spleniumda kanama var. Hangi yaralanma örüntüsü?

   • Travmatik aksonal yaralanma
   • Kortikal kontüzyon
   • Epidural hematom
   • Venöz sinüs trombozu
   Cevabı göster

   Travmatik aksonal yaralanma. Beyaz cevher-gri madde bileşkesi ile korpus kallozum, travmatik aksonal hasarın sık görülen yerleridir. Kontüzyon korteks ağırlıklıdır; epidural kan ekstraaksiyeldir; venöz sinüs trombozu sinüs lümenine odaklanır.

2. Nörolojik etkilenme belirgin, kontrastsız BT'de makrokanama yok. Akson hasarını daha duyarlı araştıran yöntem?

   • Beyin MR
   • Kemik pencere BT
   • Kontrastlı kafa BT
   • Kafa grafisi
   Cevabı göster

   Beyin MR. MR, özellikle duyarlılık ve difüzyon sekanslarıyla küçük hemorajik ve kanamasız aksonal lezyonları BT'den daha iyi gösterebilir. BT normal ya da silik olsa da diffüz aksonal yaralanma dışlanmaz; şüphe sürüyorsa MR, özellikle duyarlılık temelli sekanslarla ek değerlendirme sağlar.

İlgili konular

• Minör künt kafa travması ve PECARN bağlamı
• Subdural hematom ve koleksiyonlar
• Şüpheli fiziksel istismarda kafa içi yaralanma

Kaynaklar

Bu sayfadaki 38 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 8 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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