Travmatik beyin sapı yaralanması

Özet

Ağır kafa travması ve rotasyonel kuvvet sonrası mezensefalon veya pons hasarı, hastanın bilinç ve nörolojik durumunu belirleyen kritik bir bulgudur. Kontrastsız BT'de büyük kanama, ödem veya kontüzyon görülebilir; küçük peteşiyal odaklar ve hemorajik olmayan hasar BT'de kolayca saklı kalır. Dorsolateral üst beyin sapı ve serebral pedinküller dikkatle taranmalı, klinik ağırlık BT ile açıklanmıyorsa MR ile ileri değerlendirme düşünülmelidir. Bası herniasyonuna bağlı Duret kanamasını birincil travmatik odaktan ayırmamak yaralanma mekanizmasının yanlış yorumlanmasına yol açabilir.

Faz ve pencere

Kontrastsız tanısal

Akut kanama beyin sapı parankiminde küçük noktasal hiperdens odak, daha büyük kontüzyon veya yaygın kanama şeklinde izlenebilir; hemorajik olmayan yaralanmada lokal düşük atenüasyon ya da BT'de belirgin bulgu olmayabilir. Kontrastsız BT klinik değerlendirmenin yanı sıra akut beyin travması değerlendirmesinin temel taşıdır; beyin sapı ve çevresindeki sisternalar incelemeye dahil edilmelidir.

Önerilen pencereler: Beyin (G 80 / M 40), Subdural (G 200 / M 75).

BT bulguları

• Dorsolateral mezensefalik peteşi — üst beyin sapının yan-arka kısmında küçük, sınırlı hiperdens odak.
• Serebral pedinküllerin simetrisini ve dansitesini kontrol edin; perimesensefalik sisterna basısı veya ödem nedeniyle pedinküllerde deformite veya kaybolma gözlenebilir, normalde ise perimesensefalik CSF ile net sınırlanmış simetrik yapılar izlenir.
• Üst pons kontüzyonu — pons parankiminde daha büyük hemorajik odak, çevresel düşük dansite veya lokal genişleme.
• Dağınık derin odaklar — talamus, hipotalamus, periaquaduktal bölge veya derin beyaz cevherde eşlik eden travmatik peteşiler.
• Beyin sapı deformasyonu — pons/mezensefalon çevresindeki sisternaların silinmesi, komşu hematom basısı veya aksiyel kontur asimetrisi.
• Herniasyon eşliği — sisternal effasman, transtentoryal yer değiştirme ve beyin sapı içindeki orta hat Duret kanaması.
• BT-MR duyarlılık farkı — BT'de izlenemeyen mikrokanama ve ödem odakları MR SWI/GRE, FLAIR ve DWI'da belirginleşebilir.

Normalde

Normal mezensefalon ve ponsun konturu iki taraflı simetriktir; serebral pedinküller benzer dansitede, prepontin ve interpedinküler sisternalar açıktır. Aynı düzeyde karşı pedinkülün genişlik ve dansitesini, beyin sapı çevresindeki sisterna açıklığını ve orta hatta yeni hiperdens bir çizgi olup olmadığını kıyaslayın.

Ayırıcı tanı

Duret kanaması

transtentoryal herniasyon ve ciddi kitle etkisi zemininde pons/mezensefalon orta hattında kanama yapar; izole dorsolateral peteşiden mekanizma ve dağılımıyla ayrılır.

Kavernöz malformasyon

genellikle sınırlı, tekrarlayan kan ürünleri içeren bir beyin sapı odağıdır; travmatik dağılım veya eşlik eden aksonal odaklar bulunmayabilir.

Akut beyin sapı iskemi

infraötörital bölge artefaktları nedeniyle BT'de erken dönemde saptanamayabilir veya kompresyona bağlı hipodensite taklit edebilir; difüzyon ağırlıklı MR duyarlılığı artırır ancak küçük lezyonlarda başlangıçta negatif olabilir.

Hemorajik kontüzyon

daha büyük, düzensiz ve ödemli parankimal kan odağı yapar; aynı travmada beyin sapı dışında kortikal yüzey odakları da beklenebilir.

Parsiyel hacim/kemik sertleşme artefaktı

posterior fossada gerçek lezyonu örtebilir ya da yapay dansite farkı oluşturabilir; komşu kesitlerde devamlılık ve simetri kontrol edilir.

Tuzaklar

• Beyin sapı gibi infratentoryal yapılarda artefaktlar ve düşük kontrast nedeniyle travmatik yaralanmalar BT'de kolayca kaçabilir veya tam olarak değerlendirilemeyebilir.
• BT'de beyin sapı odağı görülmemesi yaralanmayı dışlamaz; ağır klinik ile açıklanamayan negatif BT'de MR mikrokanama ve ödemi daha duyarlı gösterir.
• Orta hat Duret kanamasını birincil dorsolateral travmatik peteşiyle eşitlemeyin; eşlik eden bazal sisterna basısı ve transtentoryal herniasyon işaretleri mekanizma için belirleyicidir.
• Tek bir hiperdens noktanın anatomik konumunu doğrulamadan beyin sapı kontüzyonu demeyin; damar kesiti, kalsifikasyon ve parsiyel hacim taklitçileri komşu kesitlerde izlenebilir.

Kendini dene

1. Erken BT'de saptanan travmatik beyin sapı kanamaları hangi üç ana patolojik tipe ayrılır?

   • Traumatik aksonal yaralanma, kontüzyon ve Duret kanaması
   • İskemik enfarkt, kavernom ve metastaz
   • Venöz infarkt, hematom ve subaraknoid kanama
   • Arterit, demiyelizasyon ve mikroanjiyopati
   Cevabı göster

   Traumatik aksonal yaralanma, kontüzyon ve Duret kanaması. Erken BT değerlendirmesinde travmatik beyin sapı lezyonları travmatik aksonal yaralanma, kontüzyon veya Duret kanaması olarak sınıflandırılır.

2. Ağır travmada orta hat beyin sapı kanamasına transtentoryal herniasyon eşlik ediyor. Bu bulgular hangi ikincil kanama mekanizmasını düşündürür?

   • Duret kanaması
   • İzole kontüzyon
   • Kavernom
   • Koroid pleksus kisti
   Cevabı göster

   Duret kanaması. Transtentoryal herniasyonla birlikte görülen beyin sapı kanaması, ikincil Duret kanaması mekanizmasını destekler. Duret kanaması, ikincil intrakraniyal basınç artışı ve transtentoryal herniasyonla ilişkili beyin sapı kanamasıdır.

İlgili konular

• Diffüz aksonal yaralanma şüphesi
• Hemorajik serebral kontüzyon

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 12 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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