Tiroid dışı tiroid komşuluğu taklitçileri

Özet

Tiroidin arka ve alt komşuluğundaki özofagus, paratiroid dokusu, lenf nodları ve damarlar aksiyel BT'de intratiroidal nodül gibi görünebilir. Ayırım, odağın bez kapsülüyle ilişkisini ve ardışık kesitlerde özofagus lümeni ya da damar yapısıyla devamını izlemekle yapılır. Boyun BT'si paratiroid odağının anatomik yerleşimini ve kontrastlanma özelliklerini gösterebilir; dinamik kontrastlanma paratiroidi komşu yapılardan ayırmaya yardımcı olabilir. Komşu yapıyı tiroid nodülü saymak gereksiz biyopsi veya yanlış cerrahi hedeflemeye; gerçek tiroid lezyonunu dışarıda sanmak ise odağın atlanmasına neden olabilir.

Faz ve pencere

Kontrastsız tanısal

Kontrastsız seride lezyonun tiroid sınırı dışında kalıp kalmadığı, özofagus içindeki hava veya içerikle ilişkisi ve doku atenüasyonu değerlendirilir; damar taklitçisi şüphesinde tek fazlı kontrastsız BT damar lümeni bağlantısını gösteremeyebilir.

Arteriyel

Paratiroid veya damar kökenli odak şüphesinde kontrastlı çok fazlı paratiroid BT protokolünün arteriyel serisi, tiroid ve komşu odağın göreli kontrastlanma örüntüsünü karşılaştırabilir; rutin tiroid nodülü değerlendirmesi için bu faz tek başına gerekli değildir.

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

BT bulguları

• Ekstratiroidal kökenli odaklar genellikle tiroid kapsülünü iter ya da bezin arkasında ayrı bir yapı olarak izlenir; tiroid dokusuyla devamlılık sınırlıdır veya yoktur.
• Servikal özofagus tiroidin özellikle sol posteromedial komşuluğunda lümen, duvar katmanları, hava veya içerik barındırabilir.
• Zenker ya da Killian-Jamieson divertikülünde kese özofagus duvarından çıkar; kesit boyunca lümene açılan dar boyun veya hava-sıvı/içerik ilişkisi bulunabilir.
• Paratiroid adenomu tiroid arkasında veya alt kutup komşuluğunda ayrı yumuşak doku odağı oluşturur; kontrastlanma paterni çekim protokolüne ve faza göre değişir.
• Trakeal divertikül/paratrakeal hava kisti çoğunlukla trakeanın sağ posterolateralinde, tiroid lobunun posteromedial komşuluğunda hava dansitesindedir; trakea ile bağlantısı ince kesitlerde görülebilir ancak gösterilememesi dışlamaz.
• Özofagus divertikülündeki kalsifikasyon veya yoğun içerik tek kesitte kalsifikasyonlu tiroid nodülü taklit edebilir.
• Damar kesiti yuvarlak, yoğun odak gibi görünebilir; arteriyel lümenle kesintisiz devamı ve komşu damarlarla eş kontrastlanması ekstratiroidal kökeni gösterir.

Normalde

Normal karşılaştırmada, tiroid lobunun posteromedial sınırındaki Zuckerkandl tüberkülü aksiyel BT'de genellikle tiroid lobuyla devamlıdır ve özofagusa doğru uzanır. Aynı aksiyel seviyeyi koronal ve sagittal düzlemde takip ederek odağın bez içinde kalıp kalmadığını, özofagus lümeniyle veya kontrastlı damar koluyla sürekliliğini karşılaştır.

Ayırıcı tanı

İntratiroidal tiroid nodülü

tiroid dokusuyla çevrelenir ve bez konturunu dışa doğru genişletebilir; özofagus lümeniyle bağlantısı olmaz.

Paratiroid adenomu

tiroidin dışında, sıklıkla posterior veya alt kutup yakınında yerleşir; çok fazlı BT'de arteriyel fazda belirgin pik enfeksiyon gösterir ve venöz faza geçişte tiroid nodüllerinden farklı yıkılma kinetiği sergiler.

Santral kompartıman lenf nodu

tiroid arkasında ayrı nodal yapı olarak kalır; hiler yağ veya nekroz gibi özellikler eşlik edebilir.

Servikal özofagus divertikülü

özofagus duvarına bağlı kese, iç hava ya da içerik ve kesitler arasında değişen biçimle tanınır.

Trakeal divertikül/paratrakeal hava kisti

çoğunlukla sağ posterolateral trakea komşuluğunda ince duvarlı hava kesesi şeklindedir; trakea lümeniyle bağlantı görülebilir, fakat her incelemede seçilmeyebilir.

Tuzaklar

• Özofagus lümenindeki hava veya içeriği intratiroidal nodül olarak yorumlama; trakeadan aşağı inen kesitlerde özofagus duvarını ve lümen devamlılığını izle.
• Kontrast sonrası paratiroid odağının tiroidden farklı kontrastlanması faz zamanlamasına bağlıdır; tek rutin venöz fazda paratiroid protokolüyle aynı çıkarımı yapma.
• Tiroid kapsülünü iten küçük nodal veya paratiroid odağında parsiyel hacim etkisi sınırı belirsizleştirebilir; koronal-sagittal devamlılığı kullan.

Kendini dene

1. Sol tiroid arkasındaki odakta küçük hava kabarcıkları var ve alt kesitlerde özofagus lümenine açılıyor. En olası yapı hangisidir?

   • Killian-Jamieson divertikülü
   • Paratiroid adenomu
   • Santral lenf nodu
   • Tiroid karsinomu
   Cevabı göster

   Killian-Jamieson divertikülü. Özofagus lümenine açılan ve hava/içerik barındıran kese divertikül kökenini gösterir. Paratiroid odağı, lenf nodu veya tiroid neoplazisi özofagus lümeniyle bu şekilde devamlılık göstermez.

2. Tiroid arkasındaki küçük solid odağın damarsal yapı olup olmadığını BT'de en iyi hangi bulgu gösterir?

   • Arter lümeniyle devamlılık
   • Özofagus duvarına yapışma
   • Santral yağlı hilus
   • Trakeaya hava bağlantısı
   Cevabı göster

   Arter lümeniyle devamlılık. Ardışık kesitlerde kontrastlı damar lümeninin odağa kesintisiz bağlanması vasküler kökeni ortaya koyar. Özofagus ilişkisi divertiküle, hiler yağ nodal yapıya, trakeal hava bağlantısı paratrakeal hava kistine işaret eder.

İlgili konular

• Piramidal tiroid lobu
• Tiroid hipoplazisi/agenezisi

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 5 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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