Fuziform anevrizma BT bulguları

Özet

Fuziform anevrizma, arterin tek bir dallanma noktasında kese yapmasından çok, duvarının çevresel biçimde uzunca bir segment boyunca genişlemesidir. Vertebral ve baziler arterlerde dolikoektazi ile örtüşebilir; damar içi trombüs, beyin sapına bası ve perforan dallarda iskemi eşlik edebilir. BTA lümen şeklini ve komşu kemik-parankim ilişkisini gösterirken, ince kesitli BT petroz kemik artefaktlarını azaltabilir ve küçük kalsifikasyonların saptanmasında avantajlıdır. Vertebrobaziler dolikoektaziye fuziform anevrizma ve/veya trombüs eşlik edebilir; bu bulgular damar morfolojisi değerlendirilirken göz önünde bulundurulmalıdır.

Faz ve pencere

Kontrastsız: Kontrastsız BT'de dolikoektatik vertebrobaziler arterler tortüöz, hafif hiperdens ve uzamış olarak görünebilir; trombüs varlığı lümenin kısmi dolumsuzluğu ile ilişkilendirilebilir.
BTA tanısal: Vertebral arter, baziler arter veya intrakraniyal ICA boyunca tek bir boyunlu kese yerine uzun segmentli çevresel lümen genişlemesi, kıvrımlı uzanım ve trombüsün opaklaşmayan kısmı gösterilir.

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

BT bulguları

Çevresel lümen genişlemesi — arter duvarı bir segment boyunca tüm çevrede genişler; odaksal boyun-kubbe ayrımı yoktur.
Dolikoektatik seyir — baziler arter orta hattan yana sapar veya olağandan daha uzun kıvrımlı seyrederek klivus ve dorsum sellae ile ilişkisini değiştirir.
Mural trombüs — BTA'da opak lümenin yanında kontrast almayan duvar içi dolum defekti, kontrastsız BT'de yumuşak doku yoğunluğu olarak seçilebilir.
Genişlemiş vertebrobaziler arter duvarındaki küçük kalsifikasyonlar BT'de saptanabilir.
Lümen düzensizliği — organize trombüs ve duvar hastalığı nedeniyle opak kanal eksantrik, daralmış veya düzensiz konturlu olabilir.
Kitle etkisi — genişlemiş baziler arter ponsu, mezensefalonu veya komşu kraniyal sinir yollarını itebilir; hidrosefali ya da eşlik eden infarkt aranır.

Normalde

Normal baziler arter pontomedüller bileşkeden yukarı doğru klivus önünde orta hatta uzanır ve apeksi suprasellar sistern düzeyinde dallanır; lümeni düzgün ve çevresel olarak genişlememiştir. Vertebral arterleri ve baziler arteri aynı düzlemde karşılaştırın; tek odaksal çıkıntı yerine uzun segmentli genişleme, lateral sapma ve beyin sapına temas olup olmadığına bakın.

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

Sakküler anevrizma: bir bifurkasyona veya arter duvarındaki odak noktaya bağlı kese ve boyun görülür; komşu segment normal kalabilir.
İntraluminal trombüs: genişlemiş arterin yalnız bir bölümünü dolduran kontrastsız materyal lümen çapını küçültür; damar dış konturu fuziform genişlemeyi gösterebilir.
Diseksiyon: uzun segment stenoz, intimal flep veya çift lümen eşlik edebilir; genişleme çoğunlukla duvar içi hematomla ilişkilidir.
Ektopik veya aşırı kıvrımlı normal arter: BT ölçümleri ile tanımlandığı üzere (>4.5 mm çap, >10 mm lateral sapma) patolojik çap genişlemesi ve lümende trombüs bulgusu taşımaz.
Baziler arter fenestrasyonu: kısa segmentte iki kontrastlı kanal tekrar birleşir; çevresel fusiform genişleme oluşturmaz.

Tuzaklar

Baziler arterin tek bir aksiyel seviyedeki geniş görünümü eğik kesit etkisi olabilir; klivus boyunca ve koronal-sagittal rekonstrüksiyonlarda lümen uzunluğunu izleyin.
Mural trombüs, yalnız kontrastlı lümen ölçülürse toplam damar çapını olduğundan küçük gösterebilir; kontrastsız ve BTA görüntülerini eşleştirin.
Baziler arterin normal anatomik varyasyonu olan hafif eğrilik tek başına dolikoektazi değildir; çap ve dallanma yüksekliği ile birlikte değerlendirin.
Kafa tabanı kemik artefaktı vertebral arterin distal lümenini örtebilir; kaynak kesitleri inceleyin ve tek başına volume-rendered görüntüye dayanmayın.

Kendini dene

BTA'da baziler arter klivus önünde uzun segment boyunca çevresel geniş ve kıvrımlı; tek boyunlu kese yok. Morfoloji hangisidir?
Cevabı göster
Fuziform anevrizma. Uzun segmentli çevresel genişleme fuziform morfolojidir. Sakküler anevrizma odaksal boyun-kubbe yapar; infundibulum dal kökenindeki konik genişlemedir; fenestrasyon iki kanallı kısa varyanttır.
Geniş baziler arterin opak lümeni yanında kontrastsız alan, dış damar konturu içinde kalıyor. En uygun tanım hangisidir?
Cevabı göster
Mural trombüs. Damarın dış konturu içinde kalan ve BTA'da kontrastlanmayan materyal mural trombüsü düşündürür. Ekstravazasyon damar dışına yayılır; fenestrasyon iki lümenli anatomik varyanttır; subaraknoid kan sisternlerde bulunur.

İlgili konular

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 7 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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