Kanamalı intrakraniyal tümör/metastaz BT bulguları

Özet

Ani nörolojik kötüleşme veya yeni nöbetle başvuran, bilinen kanseri olan ya da tümör riski taşıyan hastada intraparenkimal kanama bazen altta yatan lezyonun ilk bulgusudur. Kontrastsız BT kanamanın yerini, kitle etkisini ve ventrikül yayılımını hızlı gösterir; kontrastlı BT'de hematom içinde veya kenarında solid nodüler kontrastlanma tümör şüphesini artırır. Hematom akut dönemde lezyon dokusunu örtebilir, bu nedenle şüpheli olguda MRI daha duyarlı karakterizasyon sağlar. Kanamanın yalnız primer damar hastalığına bağlanması tümör tanısını geciktirebilir ve ek lezyonları atlatabilir.

Faz ve pencere

Kontrastsız tanısal: Akut kan çoğunlukla hiperdens hematom olarak izlenir; hematom çevresindeki vazojenik ödem, beklenen kitle hacmine göre yaygın olabilir ve sınırlar düzensizleşebilir. Aynı görüntüde küçük nodüler solid bileşen kan tarafından örtülebilir.
Kontrastlı tanısal: Kontrast sonrası kesitlerde hematomun kenarında veya içinde nodüler veya solid iyot tutulumu aranır; bu bulgular metastaz şüphesini artırır. Akut kanama dokuyu maskeleyebileceği için negatif kontrastlı BT tümörü dışlamaz.

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

BT bulguları

Orantısız vazojenik ödem — hematom çevresindeki beyaz cevher hipodensitesi, kanama boyutuna göre geniş bir alana yayılır.
Akut kanamalı metastazlar beyine göre hiperdens görünür; kontrast sonrası nodüler veya halka şeklinde tutulum ve lezyon boyutundan bağımsız olarak belirgin vazojenik ödem beklenir.
Nodüler kontrastlanma — hematom içinde ya da hemen kenarında damar dışı solid kontrastlanan odak.
Çoklu hemorajik odak — özellikle gri-beyaz cevher bileşkesindeki ayrı lezyonlar metastaz olasılığını yükseltir.
Melanom, renal hücreli, tiroid ve koryokarsinom öyküsü şüpheyi artırır; akciğer ve meme metastazları en sık kanayan tümörlerdir.
Kitle etkisi — ventrikül basısı, orta hat itilmesi veya herniasyon bulguları eşlik edebilir.

Normalde

Kontrastsız BT tek başına metastaz taraması için yeterli değildir; ancak bulgular tanıda ipucu verebilir ve kontrastlı değerlendirmeye yönlendirir. Perihematomal vazojenik ödem ile kontrast alan lezyon boyutu arasındaki oran değerlendirilmeli; metastazlarda bu oran yüksek deregli gliomalara göre belirgin şekilde artmıştır.

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

Hipertansif primer hematom: bazal ganglion kanaması, hipertansif intrakraniyal kanama ile uyumlu olabilir.
Metastatik lezyonlar genellikle gri-beyaz cevher bileşkesinde ve büyük arter vasküler bölgelerin sınır zonlarında yerleşim gösterir.
Bilinmeyen malignitede yeni tanı alan tek odaklu enhansan lezyonlarda doğru tanı koymada proton MR spektroskopisi ve dinamik kontrast perfüzyon gibi ileri MR teknikleri yardımcı olur.
MRI'da karakteristik hemosiderin halkası ile heterojen lezyon olarak izlenir; kanama yapma eğilimindedir.
Hemorajik arteriyel infarkt: iskemik infarktı hemorajik dönüşüm izleyebilir.

Tuzaklar

İyotlu kontrast tutulumu metastaz tespitinde kritik olup; metastazlar kontrastlı BT'de halka, nodüler veya solid enhansan paternler gösterebilir.
Kanamalı metastazların hepsi tek bir primer tümör tipine özgü değildir; çoklu lezyon ve klinik öykü tanıyı destekler ama BT'de kesin histoloji vermez.
Akut hematom tümörü örtebilir; çevresel ödem ve düzensiz kontur şüphe uyandırıyorsa negatif ilk kontrastlı incelemeyi dışlama kabul etmeyin.

Kendini dene

Bilinen kanserli hastada lobar hematom çevresinde geniş ödem ve kenarda kontrastlanan nodül var. En olası açıklama nedir?
Cevabı göster
Kanamalı metastaz. Perihematomal geniş vazojenik ödem ile kalıcı nodüler kontrastlanma altta yatan tümörü destekler. Hipertansif hematom tipik derin yerleşimlidir; kavernomda MRI hemosiderin halkası yardımcıdır; arteriyel enfarkt damar alanına uyan hipodens iskemi gösterir.
Kontrastlı görüntülemede, akut hematomun kenarında veya içinde nodüler veya halka şeklinde iyot tutulumu izlenirse altta yatan metastatik lezyon şüphesi artar.
Cevabı göster
Metastaz. İyotlu kontrast tutulumu metastaz tespitinde kritik olup; metastazlar kontrastlı BT'de halka, nodüler veya solid enhansan paternler gösterebilir.

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 12 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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