Retrofaringeal veya medial seyirli karotis arter

Özet

Servikal internal karotis arterin kıvrımlı, medialize veya retropharyngeal seyri çoğu kez tesadüfi bir anatomik varyanttır. BT anjiyografi arterin farinks lümeni ve duvarıyla ilişkisini göstererek cerrahi, biyopsi veya hava yolu girişimi öncesi damar yaralanması riskini ortaya koyar. Arter farinks arkasında ya da mukozaya çok yakınsa rutin bir transoral girişim bile ciddi kanamaya yol açabilir. Damarı retropharyngeal lenf nodu veya yumuşak doku odağı sanmak da yanlış tanısal girişime neden olabilir.

Faz ve pencere

BTA tanısal

Kontrastlanan ICA'nın aksiyel ve koronal kesitlerde farinks arkasına medial kıvrımı, lümende darlık olup olmadığı ve posterior farinks duvarına en yakın noktası izlenir.

Önerilen pencereler: Anjiyo (G 600 / M 150), Yumuşak doku (G 400 / M 40).

BT bulguları

• ICA normal lateral karotis kılıfı konumundan medial tarafa yönelerek parapharyngeal alanı daraltabilir veya retropharyngeal aralığa girebilir.
• Aksiyel BT'de damar farinks duvarının hemen posteriorunda, bazen orta hatta yakın görülür; koronal planda kraniokaudal devamlılığı korunur.
• Medial seyir farinks lümeninde dıştan bası ya da mukozal konturda hafif kabarıklık oluşturabilir.
• Bilateral ve tek taraflı varyant olabilir; karşı tarafla kıyas asimetrik medializasyonu görünür kılar.
• Kıvrım, keskin açılanma veya loop eşlik edebilir; damar çapı ve lümen açıklığı ayrıca incelenir.
• Arter-farinks duvarı aralığı, olası transoral girişim açısından kaydedilir; milimetrik ölçüm risk sınıflamasına bağlanacaksa kullanılan sınıflamanın anatomik düzey koşulu da belirtilir.

Ölçütler ve sınıflamalar

Pfeiffer-Ridder sınıflamasında farinks duvarına yakınlık

Pfeiffer–Ridder sınıflamasında damar-faranks aralığı derecelendirilir; ölçüm düzlemi ve faranks seviyesi rapor edilmelidir. Pfeiffer-Ridder derecelendirmesi mevcut bir şemadır; minimum mesafe ve farinks düzeyi doğrudan rapor edilmelidir.

Pfeiffer–Ridder sınıflaması

Pfeiffer–Ridder sınıflaması, internal karotis arterin farinks duvarına olan uzaklığına göre risk derecelerini belirlemek amacıyla kullanılır. Bu sınıflama, medialize ICA'nın yarattığı cerrahi riski niceliksel olarak sınıflandırmak için bir çerçeve sunar. ICA varyantlarının yarattığı risk nedeniyle, ICA'nın farinks duvarına olan uzaklığı ve ölçümün yapıldığı farinks düzeyi her zaman doğrudan rapor edilmelidir.

Normalde

Normalde ICA, farinks lateralinde karotis kılıfı içinde yükselir ve posterior farinks duvarına belirgin bir retropharyngeal kabarıklık yapmaz. Aynı aksiyel seviyede iki ICA'nın farinks duvarına uzaklığını ve koronal kesitlerde damarların lateralden kraniyale devam edip etmediğini karşılaştır.

Ayırıcı tanı

Retropharyngeal lenf nodu

arteriyel fazda damar gibi kontrastlanmaz ve damar lümeniyle devam etmez.

Parapharyngeal kitle

damarları yer değiştirebilir; ICA lümeni içinde lezyon değil, çevresinde yumuşak doku kitlesi izlenir.

Karotis anevrizması

BT anjiyografide fokal damar genişlemesi veya sakküler yapı olarak izlenir; basit konumsal varyantlardan ayırt edilir.

Karotis diseksiyonu

intimal flep, eksantrik dar lümen veya mural hematom eşlik edebilir.

Tuzaklar

• Tek aksiyel kesitte retropharyngeal damarı lenf nodu sanma; kontrastlı lümeni ve üst-alt kesitlerde damar devamlılığını izle.
• Damar konumu zaman içinde değişebildiğinden eski BT'de normal görülmesi güncel girişim öncesi varyantı dışlamaz.
• En yakın duvar mesafesini ölçerken görüntü düzlemi ve farinks seviyesi belirtilmezse risk derecesi yanlış yorumlanabilir.
• Pfeiffer–Ridder derecelendirmesi kullanılırken ölçüm düzlemi ve farinks seviyesi dikkate alınmalıdır. En kısa damar-farinks mesafesini, ölçüm düzlemini ve farinks seviyesini doğrudan belirt.

Kendini dene

1. Transoral biyopsi planlanan hastada ICA, orofarenks arka duvarına dayanıyor. BT'deki kritik anlam nedir?

   • Retropharyngeal ICA
   • Retropharyngeal apse
   • Nekrotik lenf nodu
   • Karotis anevrizması
   Cevabı göster

   Retropharyngeal ICA. Kontrastlanan damar lümeninin farinks duvarına çok yakın seyri varyant arter ve girişim kanama riski gösterir. Apse ve lenf nodu damar lümeniyle devamlılık göstermez; anevrizmada fokal damar genişlemesi beklenir.

2. Retropharyngeal alanda yuvarlak kontrastlanan yapı için damar olduğunu en iyi hangi bulgu destekler?

   • Arteriyel lümenle devamlılık
   • Santral düşük atenüasyon
   • Çevresel yağlı hilus
   • Çok odacıklı sıvı
   Cevabı göster

   Arteriyel lümenle devamlılık. Aksiyel ve multiplanar kesitlerde ICA lümeniyle devam eden kontrastlanma damarı tanımlar. Santral düşük atenüasyon nekroz lehinedir; yağlı hilus lenf nodu morfolojisini destekler, çok odacıklı sıvı ise kistik lezyondur.

Kaynaklar

Bu sayfadaki 40 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 8 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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