Subakut infarktın kontrastlanması: tümör taklitçisi

Özet

Günler veya haftalar önce başlamış nörolojik yakınması olan hastada subakut infarkt, ödemli korteksi ve kontrastlanmasıyla kitleyi taklit edebilir. Kontrastsız BT'de gri-beyaz cevher arayının silinmesi, kortikal sulkusların düzleşmesi ve damar yatağına uyum gösteren hipodensite izlenebilir; altıncı günden sonra lezyonun kenarları belirginleşip kitle etkisi artar. Lezyonun arter sulama alanına uyması, korteksi izlemesi ve zaman içindeki atenüite/kitle etkisi değişimi doğru yorum için önem taşır; MRI difüzyon ve klinik başlangıç zamanı ayrımı güçlendirir. Vasküler dağılım ve seri değişim göz ardı edilirse infarkt tümör sanılabilir veya kitleye bağlı akut kitle etkisi infarkt kabul edilerek gecikebilir.

Faz ve pencere

Kontrastsız tanısal

Akut evrede gri-beyaz sınırı silinmesi ve sulkus basısı görülürken; subakut evrede vazojenik ödem nedeniyle kitle etkisi ve hipodensite belirginleşir, lezyon kenarları netleşir.

Kontrastlı

Subakut evrede lezyonda kontrastlı MR ile boyanma/hiperintensite izlenebilir; ancak bu bulgu tek başına tümör kanıtı değildir ve arter alanına uyan dağılım ile birlikte değerlendirilmelidir.

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

BT bulguları

• Hipodensite, MCA, ACA veya PCA gibi bir arterin beslediği kortikal ve komşu subkortikal alana uyar.
• İnsular şerit veya lentiform çekirdekte silikleşme ve gri-beyaz ayrım kaybı eşlik edebilir.
• Kontrast sonrası kıvrımları izleyen kortikal boyanma giral paterndedir; düzensiz kitle kenarı biçiminde olmak zorunda değildir.
• Etkilenen hemisferde sulkus silinmesi ve ventriküle bası, ödemin kitle etkisini gösterir; yayılımı damar alanı içinde kalabilir.
• İlerleyen dönemde sığalaşma ve doku kaybı gelişerek lezyon kalıcı olarak hipodens görünüm kazanır.
• İnfarkt alanında peteşiyal ya da parankimal kanama dönüşümü gelişebilir.

Normalde

Normal BT'de insular şerit, lentiform çekirdek ve kortikal gri-beyaz sınır belirgindir; sulkuslar simetrik açıklıktadır ve damar alanına uyan fokal hipodensite ya da giral kontrastlanma yoktur. Kıyaslamada şüpheli kortikal boyanmanın MCA/ACA/PCA sulama sahasını izleyip izlemediğine, aynı sahada erken iskemi işaretleri olup olmadığına ve komşu sulkusların basılıp basılmadığına bakılır.

Ayırıcı tanı

Yüksek dereceli gliom

damar sınırlarını aşan infiltratif kitle, düzensiz nekrotik merkez ve nodüler çevresel kontrastlanma gösterebilir.

Beyin metastazı

yuvarlak kitle ve belirgin vazojenik ödem oluşturabilir.

Ensefalitte temporal lob tutulumu görülebilir; ayırım klinik bulgular, MRI ve gerektiğinde BOS incelemesiyle yapılır.

Postiktal değişiklikler genellikle damar yatağı sınırlarını aşmayacak şekilde kortikal tutulum gösterir; nöbet öyküsü ve kısa aralıklı seri incelemelerde regresyon ayırıcı tanıyı destekler.

Serebral venöz infarkt

arter alanı dışına taşan ödem ve kanama ile birlikte venöz sinüs ya da kortikal ven trombozu aranır.

Tuzaklar

• Giral kontrastlanmayı tek başına tümör kabul etme; infarktla ilişkili kortikal boyanma günler-haftalar içinde ortaya çıkabilir.
• Subakut BT fogging döneminde infarkt atenüitesi silikleşebilir; önceki BT/MRI varsa doğrudan yan yana karşılaştır.
• Subakut evrede vazojenik ödem nedeniyle kitle etkisi ve herniasyon riski en üst düzeydedir; bu durum lezyonun benign veya yapışkan olmayan doğasını ortadan kaldırmaz.
• Tek bir zamanda çekilmiş kontrastlı BT, infarkt-tümör ayrımını kesinleştirmeyebilir; belirtilerin başlangıcı ve difüzyon MRI'sı tanısal bağlamı değiştirir.

Kendini dene

1. Yakınmaları bir haftadır süren hastada PCA alanına uyan kortikal hipodensite ve giral boyanma var. En olası açıklama nedir?

   • Subakut infarkt
   • Glioblastom
   • Beyin apsesi
   • Primer lenfoma
   Cevabı göster

   Subakut infarkt. Akut evre sitotoksik ödemin ardından gelen subakut evrede vazojenik ödem nedeniyle lezyon kenarları belirginleşir ve kitle etkisi artar; bu dönemde infarkt ile gliomalar iyi bilinen radyolojik taklitçilerdir.

2. İkinci haftada daha önce görülen damar alanı hipodensitesi BT'de daha az belirgin. Bu değişim nasıl adlandırılır?

   • BT fogging
   • Vazojenik halka
   • Kortikal laminer hematom
   • Ex vacuo genişleme
   Cevabı göster

   BT fogging. Subakut dönemde infarkt atenüitesi geçici olarak normal beyin yoğunluğuna yaklaşabilir; buna BT fogging denir ve lezyon sınırını olduğundan küçük gösterebilir. Diğer seçenekler bu geçici atenüite değişimini tanımlamaz.

İlgili konular

• Ensefalit

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 10 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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