Özet
Kafa travması sonrası gelişen fokal veya yaygın parankim şişmesi, erken BT’de yalnız kitle etkisiyle başlayabilir ve ilerleyen ödemle yoğunluk değişikliği belirginleşebilir. Kontrastsız BT, eşlik eden kanamayı ve beyin dokusunun sulkus, ventrikül ve sisternlere yaptığı basıyı hızlıca gösterir. Sulkusların ve bazal sisternlerin kaybı, ventrikül basısı veya gri-beyaz cevher ayrımının silinmesi kafa içi basınç artışını düşündürür. Bu değişiklikler gözden kaçarsa hızla ilerleyen herniasyon ve beyin sapı basısı fark edilmeyebilir.
Faz ve pencere
- Kontrastsız tanısal
- Şişmiş parankimde sulkuslar daralır, ventriküller basılanır ve bazal sisternler silinebilir; erken şişmede gri-beyaz ayrım korunabilir, sitotoksik ödemde ayrım azalır ve ödemli alan hipodensleşebilir.
Önerilen pencereler: Beyin (G 80 / M 40), Subdural (G 200 / M 75), Kemik (G 1800 / M 400).
BT bulguları
- Konveksite sulkuslarında iki taraflı yaygın daralma veya silinme
- Suprasellar, ambient veya prepontin sisternlerde kitle etkisine bağlı daralma
- Lateral ventrikül gövdeleri ve temporal hornlarda basılanma
- Korteks ile komşu beyaz cevher arasındaki dansite farkının silinmesi
- Fokal kontüzyon çevresinde bölgesel ödem ve lokal sulkal effasman
- Tek taraflı kitle etkisi varsa septum pellucidumun karşı tarafa itilmesi
- İleri olguda tentoryal veya foramen magnum düzeyine uzanan doku yer değiştirmesi
Normalde
Her anatomik düzeyde normal BT ile karşı tarafı kıyaslayın: konveksitede kortikal sulkuslar seçilir, lateral ventriküller benzer genişliktedir ve gri-beyaz sınır nettir. Daha alt kesitlerde bazal sisternler BOS dansitesindeki açıklığını korur.
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 s0103; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.
Ayırıcı tanı
- Yaygın hipoksik-iskemik hasar
- global hipoperfüzyona bağlı olarak korteks ve derin gri çekirdeklerde gri-beyaz dansite oranında azalma ile gri-beyaz ayrım kaybı belirgin olabilir.
- Beyin hiperemisi
- travmatik beyin hasarında etkilenen bölgelerde artmış perfüzyon görülebilir.
- Fokal kontüzyon
- yüzeyel, çoğu kez hemorajik odak ve çevresinde sınırlı ödem oluşturur
- Obstrüktif hidrosefali
- ventriküller basılanmak yerine genişler; temporal hornlar ve periventriküler hipodensite eşlik edebilir
Tuzaklar
- Erken travmatik şişmede gri-beyaz ayrımın korunması ödemi dışlamaz; sulkus, ventrikül ve sistern basısını birlikte ara.
- Orta hat kaymasının belirgin olmaması yaygın beyin şişmesini tek başına dışlamaz; sulkal effasman, ventrikül basısı ve gri-beyaz cevher ayrımının kaybı da ödemle ilişkili BT bulgularıdır.
Kendini dene
Travma sonrası iki hemisferde sulkuslar silik ve ventriküller basılı; gri-beyaz sınır hâlâ seçiliyor. En uygun yorum nedir?
Cevabı göster
Erken yaygın beyin şişmesi. Yaygın sulkal ve ventriküler bası şişmeyi gösterir; erken evrede gri-beyaz ayrım korunabilir. Hidrosefalide ventriküller genişler; kanama tanıları için ekstraaksiyel veya sulkal hiperdens kan beklenir.
Yaygın sulkal silinmeye ek olarak korteks ile beyaz cevher sınırları seçilemiyor. Hangi değişiklik belirginleşmiştir?
Cevabı göster
Sitotoksik ödem. Gri-beyaz ayrımın silinmesi sitotoksik ödem/iskemik hücresel şişmeyle uyumludur. Atrofide sulkuslar ve ventriküller genişler; subdural koleksiyon ekstraaksiyel yerleşimlidir.
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