İntraparenkimal hematom BT bulguları

Özet

İntraparenkimal hematom, kanın beyin dokusu içinde birikmesidir; ani nörolojik defisit veya bilinç bozukluğunda hızlı tanı ve yayılım değerlendirmesi kritik önem taşır. Kontrastsız BT, akut hematomu ve buna bağlı kitle etkisini değerlendirmede birincil incelemedir; ventriküle uzanım ve hidrosefali de bu seride izlenebilir. Seçilmiş hastada BTA aktif kontrast ekstravazasyonunu ve altta yatan makrovasküler nedeni araştırmaya yardımcı olur; derin, lobar, infratentoryal veya travmatik yerleşim etiyoloji yorumunu değiştirir. Hematom hacmi, beyin sapı/serebellum basısı ya da ventrikül tıkanmasının atlanması hızlı kötüleşmenin ve cerrahi açıdan önemli anatomik etkilerin gözden kaçmasına neden olabilir.

Faz ve pencere

Kontrastsız tanısal: Akut pıhtı BT'de tipik olarak hiperdens odak oluşturur; zaman, anemi, pıhtılaşma durumu ve hematom içi serum nedeniyle yoğunluk değişkenlik gösterebilir. Çevresel düşük atenüasyonlu ödem, ventrikül içine açılım, sistern basısı ve orta hat kayması aynı seride incelenir.
BTA tanısal: Seçilmiş olguda hematom içinde damar lümenine bağlı olmayan kontrast yoğun odağı (spot sign/ekstravazasyon) aktif kanama ve hematom genişlemesi olasılığını düşündürür. Bu inceleme akut kanamanın saptanması için zorunlu değildir ve tüm intraparenkimal hematomlarda rutin tanısal faz olarak yorumlanmamalıdır.

Önerilen pencereler: Beyin (G 80 / M 40), Subdural (G 200 / M 75), Kemik (G 1800 / M 400), Anjiyo (G 600 / M 150).

BT bulguları

İntraparenkimal hiperdens odak — bazal gangliyon, talamus, lobar kortiko-subkortikal alan, beyin sapı veya serebellum içinde pıhtı.
Heterojen hematom — pıhtı içinde farklı atenüasyonlu alanlar; heterojenlik veya düşük yoğunluklu odaklar hematom genişlemesi açısından dikkate alınmalıdır.
Çevresel ödem — hematom çevresinde parankimden daha düşük dansiteli, sınırları silikleştiren alan.
Ventriküle açılım — hematomdan lateral, üçüncü veya dördüncü ventriküle uzanan hiperdens kan.
Hidrosefali — ventrikül içi kanla ilişkili ventriküler genişleme ve transependimal BOS geçişi.
Kitle etkisi — komşu sulkusların silinmesi, ventrikül deformasyonu, bazal sisternlerin basısı veya orta hat yer değiştirmesi.
Yerleşim örüntüsü — derin gangliyon/talamik, lobar, infratentoryal ya da travmayla ilişkili dağılım olası nedeni yönlendirir.
BTA spot sign — hematom içinde kontrastlanan küçük odaklar aktif ekstravazasyon lehine olabilir; damar devamlılığı gösteren yapıdan ayrılmalıdır.

Normalde

Normal karşılaştırmada beyin penceresi, parankimi ve ince dansite değişikliklerini değerlendirmeyi sağlar. Karşı hemisferdeki eş anatomik bölgeyle kıyaslayarak parankim yoğunluğunu, ventrikül biçimini ve orta hat konumunu inceleyin; bazal sisternlerin açık olup olmadığı da kitle etkisini gösterir.

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

Hemorajik tümör: kanama çevresinde solid bileşen veya nodüler yapı düşünülmelidir; kanama nedeniyle altta yatan lezyonun görüntülenmesi zorlaşabilir.
Hemorajik kontüzyon: travma sonrası yüzeyel, sıklıkla inferior frontal veya temporal kutup yerleşimli düzensiz parankimal kan odakları.
Kavernom kanaması: akut BT'de kalsifikasyon veya kanama olarak görünüp ayırıcı tanıda yetersiz kalabilir; MR'da SWI/T2* dizilerde izlenen 'mulberry' çekirdek ve hemosiderin çeperi ayırt edicidir.
Kalsifikasyon: yoğunluğu yüksek olsa da kronik ve keskin sınırlıdır; önceki incelemeler, kemik penceresi ve anatomik dağılım yardımcıdır.

Tuzaklar

Hiperdens odağın tamamını taze kan varsaymayın; kalsifikasyon, kontrast tutulumu ve damar kesiti kemik penceresi veya önceki BT ile ayırt edilebilir.
Hematoma çevresindeki hipodens alanları otomatik olarak ödem saymayın; kaynağı belirlemek için Hounsfield birimi eşiklerini kullanın (örneğin <40–55 HU ödem lehine, >80 HU kalsifikasyon/artefakt lehine).
Sadece en büyük aksiyel kesiti incelemek infratentoryal uzanımı veya ventrikül içi kanı kaçırabilir; tüm seri boyunca hematomun sınırını takip edin.
Tek fazlı BTA spot sign'ı kaçırabilir; çok fazlı BTA ile geç ortaya çıkan kontrast ekstravazasyonu tespit edilerek hematom genişleme riski daha doğru değerlendirilir.

Kendini dene

Hipertansiyon öykülü hastada putamen içinde hiperdens hematom, çevresel ödem ve ipsilateral ventrikül basısı var. Kanama hangi kompartımandadır?
Cevabı göster
Beyin parankimi. Putamen içindeki odak parankimal hematomdur; çevresel ödem ve ventrikül basısı kitle etkisini gösterir. Subaraknoid kan sulkus/sisternleri doldurur; subdural ve epidural hematomlar beyin dokusu dışındadır.
Lobar hematomun içinde BTA'da damar lümenine bağlı olmayan kontrastlı küçük odak görülüyor. Bu bulgu en çok neyi düşündürür?
Cevabı göster
Aktif kontrast ekstravazasyonu. Hematoma gömülü kontrast odağı spot sign olarak adlandırılır ve aktif ekstravazasyon olasılığıyla ilişkilidir. Sinüs trombozu venöz damarda dolum kusurudur; kalsifikasyon kontrast fazında yeni odak değildir; infarkt parankim dağılımıyla tanınır.

İlgili konular

Kaynaklar

Bu sayfadaki 39 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 10 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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