Pediatrik beyin tümörleri: BT’de kitle ve kalsifikasyon BT bulguları

Özet

Çocukta yeni nörolojik bulgu, nöbet veya kafa içi basınç artışı belirtileri beyin kitlesinin ilk kez BT’de fark edilmesine yol açabilir. Kontrastsız BT kanama, kalsifikasyon, ödem, hidrosefali ve kitle etkisini hızlıca ortaya koyar; BT tümör tipini güvenilir biçimde belirlemez. Kontrastlanan solid ve kistik bileşenleri gösterebilir, ancak karakterizasyon ve yayılım için MR daha duyarlıdır. Kitle etkisi veya BOS yolu tıkanması atlanırsa acil kötüleşme riski gözden kaçar.

Faz ve pencere

Kontrastsız tanısal: Kitle atenüasyonu, kalsifikasyon, akut kanama, çevresel ödem, orta hat kayması ve ventriküler obstrüksiyon değerlendirilir; kontrastsız seri akut BT değerlendirmesinin temelidir.
Kontrastlı: Kontrastlı BT’de kavernöz malformasyonlarda kontrastlanma minimal olabilir veya görülmeyebilir; bu BT bulguları özgül değildir. BT bulguları tümör alt tipini tek başına belirlemez; kesin tanıda histopatolojik inceleme gerekir.

Önerilen pencereler: Beyin (G 80 / M 40), Kemik (G 1800 / M 400).

BT bulguları

Parankim içinde fokal kitle ile çevresindeki ödem ve kitle etkisi değerlendirilir.
Lezyonun gri cevhere göre hiperdens, izodens ya da hipodens olması tek başına histolojik tanı koydurmaz.
Kalsifikasyonun tümör içinde noktasal, kaba veya kümeli dağılımı kaydedilir.
İntralezyonel kanama ve nekrotik/kistik düşük atenüasyon alanları ayrı bileşenler olarak tanımlanır.
Parankimal kitlenin çevresinde vazojenik ödem ve komşu ventriküllerde bası veya obstrüksiyon izlenerek kitle etkisi değerlendirilir.
Kontrastlı BT elde edilmişse solid doku, duvar veya nodül kontrastlanabilir; bu görünüm tümör alt tipini tek başına belirlemez ve MRI ile karakterizasyonun yerini tutmaz.
Ventriküler sistem veya bazal sistern basısı hidrosefali ve herniasyon riski açısından gözden geçirilir.

Normalde

Ventrikül genişlemesi, BOS akımındaki tıkanıklıkla ilişkili olabileceği gibi beyin atrofisine de eşlik edebilir. Kaba lezyon içi kalsifikasyon, erişkin tip diffüz gliomlarda oligodendrogliomayı destekleyen görüntüleme özelliklerindendir.

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

İntraparenkimal kanama BT’de hiperdens bir bileşen olarak görülebilir.
Beyin apsesi, kontrastlı MR’da halka kontrastlanması ve santral difüzyon kısıtlanması gösterebilir.
Enfarkt BT’de saptanabilir.
İntrakraniyal kalsifikasyonlara eşlik eden kistik lezyonlar primer beyin tümörünü taklit edebilir.

Tuzaklar

Arka fossa tümörleri sınırlı boşluk nedeniyle hızlı hidrosefali ve beyinsapı basısına yol açabilir; ventriküler sistem ve sisternlerin obstrüksiyonu acil olarak değerlendirilmelidir.
Kavernöz malformasyonların BT bulguları özgül olmayabilir ve tümörleri taklit edebilir.
BT bulguları tek başına tümörün histopatolojik tanısını belirlemez.

Kendini dene

Çocukta kontrastsız BT’de heterojen kitle, kalsifikasyon ve çevresel ödem var. BT’den hangi sonuç çıkar?
Cevabı göster
Kitle ve kitle etkisi. BT, kitleyi, iç yoğunlukları ve bası etkisini gösterir; tümörün histolojik veya moleküler alt grubunu belirlemez.
Foramen Monro tıkanıklığından şüphe edilen bir bebekte iki lateral ventrikül geniş, üçüncü ve dördüncü ventriküller normal boyuttadır. Bu patern en iyi nasıl açıklanır?
Cevabı göster
Foramen Monro tıkanıklığına bağlı obstrüktif hidrosefali. Foramen Monro tıkanıklığı obstrüktif hidrosefaliye yol açabilir; bildirilen olguda lateral ventriküller geniş, üçüncü ve dördüncü ventriküller normal boyuttadır.

İlgili konular

Kaynaklar

Bu sayfadaki 34 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 16 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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