İntrakraniyal arter duvarı kalsifikasyonu BT bulguları

Özet

İntrakraniyal arter duvarı kalsifikasyonu çoğunlukla internal karotid arterin kavernöz-paraklinoid kesimlerinde, ayrıca vertebral ve baziler arterlerde görülen damar duvarı mineralizasyonudur. Kontrastsız BT kalsifikasyonun damar boyunca yerini ve şeklini gösterir; BT anjiyografi lümeni, plakla ilişkili daralmayı ve damar açıklığını değerlendirir. Kontrastsız BT'de kalsifikasyonun kendisi tek başına lümen darlığının derecesini ölçmez; damar duvarı bileşenlerinin (intimal-medial) ayırımı için yüksek çözünürlüklü damar duvarı MRG daha uygun bir yöntemdir. Mural kalsiyum genellikle stabil ateromatoz plağa işaret ederken, lümen içindeki serbest cisimler veya yumuşak doku yoğunluğu olan trombüsler farklı klinik yönetim gerektirir.

Faz ve pencere

Kontrastsız tanısal: Kavernöz veya paraklinoid internal karotid arter, vertebral arter ve baziler arter seyri boyunca duvarla ilişkili yüksek atenüasyonlu çizgisel, noktasal ya da halka biçimli kalsiyum görülür. Kontrastsız görüntü damar kalsiyumunun morfolojisini gösterir; lümen derecesini doğrudan ölçmez.
BTA tanısal: İntrakraniyal arter lümenindeki opaklaşma izlenir; kalsifiye segmentte eşlik eden plak, lümen daralması veya tıkanıklık araştırılır. Kalsiyum hacmi tek başına stenoz derecesi değildir ve yoğun kalsiyum lümen sınırını kısmi hacim etkisiyle belirsizleştirebilir.

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

BT bulguları

Sifon ve kavernöz internal karotid arter boyunca damar konturunu izleyen mural kalsiyum
Kalsiyumun ekstenzyonu ve kalınlığı başlıca derecelendirme faktörleridir; dairesellik veya eksantrik yapı intimal-medial ayrımına işaret edebilir.
Vertebral arter intrakraniyal segmenti veya baziler arter duvarında benzer mineralizasyon
Karşılıklı internal karotid arter kalsifikasyonlarını sağ ve sol için ayrı değerlendirin.
BTA'da kalsifiye segment boyunca opak lümenin devamlılığı ve çapı
Damar duvarındaki kalsiyum ile komşu kafa tabanı kemiklerinin yüksek yoğunluğu arasındaki ayrım, özellikle yarım-kalınlık etkisi nedeniyle önemlidir.

Normalde

Kavernöz internal karotid arterde yaşa bağlı kalsifikasyon sıklıkla görülür; aynı düzeyde normal BT'de belirgin lümen daralması veya akut patoloji bulunmaz, baziler ve vertebral arter lümenleri simetrik, kesintisiz izlenir. Karotid sifonlar karşılaştırılırken kalsifikasyonu komşu kafatası kemiklerinden ayırmak gerekir; BT anjiyografide kontrastlı lümenin çapı, kalsifikasyonun yarattığı blooming artefaktından bağımsız olarak değerlendirilmelidir.

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

Kafa tabanı kemiklerinin yüksek atenüasyonu, özellikle sfenoid kemik kanallarında, intrakraniyal arter kalsifikasyonu ile karışabilir.
Akut intraluminal trombüs damar lümeninde yer alır ve kısmi yapışkanlık gösterebilirken, kronik mural kalsiyum damar duvarına sıkıca yapışmış sert yoğunluklar olarak görünür; bileşenlerin kesin ayırımı için MRG teknikleri önerilmektedir.
Kafa tabanı kemiklerinin ve dural yapıların kalsifikasyonu, arterin beklenen anatomik seyrinden sapabilir veya yakın komşuluk nedeniyle karıştırılabilir.
Akut intraluminal trombüs: genellikle yumuşak doku yoğunluğu ve damar genişlemesi yapabilir; kronik mural kalsiyum gibi parlak duvar çizgisi değildir

Tuzaklar

Kafa tabanı kemiklerinin yüksek yoğunluğu karotid sifon kalsiyumunu örtebilir; ardışık kesitlerde damar yolunu izleyerek kemikten ayırın.
Eksantrik ve çevresel biçim intimal veya medial yerleşim hakkında ipucu verebilir, ancak CT görünümünden histolojik alt tipi kesinleştirmeyin.
BTA'daki blooming ve kısmi hacim, yoğun kalsiyum komşuluğunda lümeni olduğundan dar gösterebilir; kalsiyumu stenoz yüzdesi yerine koymayın.

Kendini dene

İnme değerlendirmesinde karotid sifon boyunca duvara yapışık yoğun çizgi görülüyor. İntrakraniyal arter duvarında, damar seyrini takip eden yoğun çizgisel veya noktasal kalsifikasyon görülüyor. Bu bulgu en çok aşağıdakilerden hangisiyle ilişkilidir?
Cevabı göster
Mural aterokalsifikasyon. Damarın beklenen seyri boyunca duvarla devamlılık intrakraniyal arter kalsifikasyonunu destekler. Lümen içindeki serbest cisimler veya yumuşak doku yoğunluğundaki trombüsler aküt olaylara işaret ederken, duvara yapışık kalsiyum kronik plak değişimini yansıtır.
Kalsifiye damar segmentinde lümen darlığının derecesini hangi inceleme doğrudan değerlendirmeye yardım eder?
Cevabı göster
BT anjiyografi. BT anjiyografi opaklaşan lümen konturunu göstererek daralma veya tıkanıklığı değerlendirir. Kontrastsız BT kalsiyumu saptar, ancak kalsiyumun yoğunluğu tek başına lümen darlığını ölçmez.

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 15 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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