Geniş hemisferik infarkt ve ödem

Özet

Geniş hemisferik infarkt, çoğunlukla proksimal MCA tıkanıklığıyla gelişen ve ödem arttıkça intrakraniyal basıncı yükselten büyük doku hasarıdır. Kontrastsız BT'de geniş alanda hipoattenüasyon ve gri-beyaz sınır kaybının yanı sıra sulkus, ventrikül ve bazal sistern basısı aranır. Orta hat kayması, subfalsin veya unkal herniasyon yönündeki ilerleme acil nörolojik kötüleşmeyi haber verebilir. Kitle etkisini veya sistern kapanmasını kaçırmak beyin sapı basısı ve herniasyon riskinin geç fark edilmesine yol açar.

Okuma sırası

1. İnsula, lentiform nükleus ve MCA korteksi. Bazal gangliyon ve insula düzeyinde gri-beyaz sınırı izleyin; hipoattenüasyonun tek küçük odak yerine geniş MCA alanına yayılıp yayılmadığını haritalayın.
2. Lateral ventrikül. Lateral ventrikül gövdesine çıkıp ipsilateral frontal boynuz ve gövdenin basılıp basılmadığını karşı tarafla kıyaslayın.
3. Septum pellucidum ve orta hat. Anatomik orta hattı belirleyin ve septum pellucidumun karşı tarafa sapmasını ölçün; bu ölçüm kitle etkisini belgeler.
4. Bazal sisternler. Tentoryal çentik düzeyinde ambient sisternlerin simetrisinin kaybolup kaybolmadığını izleyin; beyin sapı çevresindeki BOS mesafelerini de değerlendirin.
5. Unkus ve ambient sistern. Unkusların konumunu ve ambient sisterni iki tarafta karşılaştırın; medial temporal lobun aşağı-mediale yer değiştirmesini arayın.

Faz ve pencere

Kontrastsız tanısal

MCA alanının geniş bölümünde veya komşu ACA/PCA alanlarına taşan hipoattenüasyon, kortikal gri-beyaz ayrım kaybı ve şişme görülür. Aynı tarafta sulkuslar ve ipsilateral lateral ventrikül basılır; septum pellucidum karşıya itilebilir, perimezensefalik/bazal sisternler daralabilir veya silinebilir. Akut ödem etkisini göstermek için kontrastsız BT yeterlidir.

BTA

İntrakraniyal arterlerde proksimal MCA veya eşlik eden büyük damar oklüzyonu ve kollateral dolum araştırılır; bu, tıkanıklığın yerini gösterir, parankimal ödem ve herniasyon değerlendirmesinin yerini tutmaz.

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

BT bulguları

• İnsula, lentiform nükleus ve frontotemporoparietal MCA korteksinde yaygın hipoattenüasyon ve gri-beyaz ayrım kaybı.
• Birden fazla arter alanına yayılan ödem; ipsilateral ACA veya PCA korteksinin de etkilenebilmesi.
• Kortikal sulkusların ve sylvian fissürün daralması, hemisferik şişliğin erken kitle etkisi.
• İpsilateral lateral ventrikül gövdesi ve frontal boynuzda bası; septum pellucidumun karşı tarafa yer değiştirmesi.
• Subfalsin yer değiştirme — singulat girusun falx altından karşı hemisfere doğru itilmesi.
• Unkal herniasyon yönünde medial temporal lobun tentoryal çentiğe yaklaşması ve ipsilateral suprasellar/perimezensefalik sisternlerin silinmesi.
• Bazal sisternlerin belirgin daralması veya kaybolması ve beyin sapı çevresindeki BOS aralıklarının kapanması.

Ölçütler ve sınıflamalar

İlk 6 saatte BT'de geniş MCA alanı erken hipoattenüasyonu (malign ödem riskiyle ilişkili radyolojik belirteç)

>%50 MCA alanı

Normalde

Normal hemisferde kortikal gri-beyaz ayrımı ve sulkuslar korunur; lateral ventriküller orta hatta benzer genişlikte, bazal sisternler açıktır. Septum pellucidumun falxla ilişkisini, ipsilateral ventrikül çapını ve suprasellar/perimezensefalik sisternlerin açıklığını karşı taraf ve önceki BT ile kıyaslayın.

Ayırıcı tanı

Beyin tümörleri ve enfeksiyonlar akut infarktı taklit edebilir; ayırıcı tanı için detaylı klinik öykü, laboratuvar incelemeleri ve çok modlu BT veya MR görüntüleme gereklidir (S50, S51).

Otoimmun ensefalit ve diğer enfeksiyonlar infarkt bulgularıyla karışabilir; ayırıcı tanı için detaylı klinik öykü, laboratuvar ve manyetik rezonans görüntüleme değerlendirmesi şarttır (S50).

Postiktal durumlar kortikal şişme ve geçici hipoattenüasyona yol açabilir; damar alanıyla örtüşmeyen perfüzyon değişiklikleri ve arteriyel oklüzyonun yokluğu ayırıcı tanıda önemlidir (S51, S75).

Hipoksi-iskemi ve metabolik toksik durumlar akut İnme taklitçileri arasında yer alır; çok modlu BT (kontrastsız, BTA, BTP) bu taklitçileri ekarte etmek ve gereksiz revasküler müdahalelerden kaçınmak için yüksek özgüllük sağlar (S51).

Serebral venöz tromboz

ödem ve hemoraji venöz drenaj alanını izler, arteriyel dağılımı aşabilir; venöz sinüs/damar trombozu BTV'de araştırılır.

Tuzaklar

• Erken büyük infarkt henüz belirgin şişme yapmayabilir; yalnız orta hat kayması yok diye ciddi iskemiyi dışlamayın, gri-beyaz ayrımı ve sulkusları da gözden geçirin.
• Eski hemisferik ensefalomalazi geniş hipoattenüasyon taklidi yapar; kronik lezyon ventrikül ve sulkusları genişletirken akut ödem bu BOS aralıklarını daraltır.
• Orta hat kaymasını yalnız septum pellucidumda değerlendirmek unkal basıyı kaçırabilir; bazal sisternleri, medial temporal lobu ve beyin sapı çevresini ayrıca inceleyin.
• Kronik lezyonlarda görülen hacim kaybının aksine, akut geniş hemisferik infarkt geniş hipoattenüasyona, orta hat kaymasına ve bazal sistern basısına yol açar.

Kendini dene

1. Geniş sağ MCA hipoattenüasyonuna sağ ventrikül basısı, sola septum kayması ve sistern silinmesi eşlik ediyor. En önemli görüntüleme yorumu nedir?

   • Malign hemisferik ödem
   • Kronik ensefalomalazi
   • Laküner infarkt
   • Küçük subdural hematom
   Cevabı göster

   Malign hemisferik ödem. Geniş arter alanı infarktı ile BOS aralıklarının basılması ve sistern silinmesi ilerleyen kitle etkisini gösterir. Kronik ensefalomalazi hacim kaybı yapar; lakün küçük ve derindir; ince subdural hematom bu yaygın parankim ödemini açıklamaz.

2. Bir hemisferde hipoattenüasyon var, ancak aynı taraftaki sulkuslar ve lateral ventrikül genişlemiş. Hangi süreç daha olasıdır?

   • Kronik infarkt
   • Akut malign ödem
   • Ensefalit
   • Arteriyel oklüzyon
   Cevabı göster

   Kronik infarkt. Sulkus ve ventrikül genişlemesi doku kaybına bağlı ex vacuo değişikliği destekler. Akut malign ödem bu boşlukları daraltır; ensefalit ve arter oklüzyonu bu kronik hacim kaybı paternini tek başına açıklamaz.

İlgili konular

• İskemik infarktın hemorajik dönüşümü

Kaynaklar

Bu sayfadaki 41 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 5 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez. İçerik yapay zekâ destekli bir süreçle güncel literatüre göre cümle cümle kaynaklarla karşılaştırıldı, ancak uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.