Lenf nodu metastazı

Özet

Lenf nodu metastazı, solid tümörlerin bölgesel yayılımını ve bazı hastalarda uzak evreyi göstererek tedavi planını değiştirebilir. Kontrastlı BT, nodal istasyonu primer tümörün drenaj yolu ve damar-anatomi ilişkisiyle eşleştirir; boyut, şekil, iç yapı ve dağılım birlikte değerlendirilir. BT mikrometastazı gösteremez ve normal boyuttaki bir nodda tümör bulunmasını dışlayamaz; şüpheli nodların kesin tanısı gerektiğinde doku örneklemesine dayanır. Nodal yayılımın yanlış evrelenmesi cerrahi alanı veya hastalığın yaygınlığını hatalı gösterebilir.

Faz ve pencere

Portal tanısal

İntravenöz kontrast sonrası lenf nodunun kısa ekseni, iç kontrastlanması, santral düşük atenüasyonlu nekroz alanı ve komşu damarlarla sınırı değerlendirilir; abdominal örnekte paraaortik, parakaval ve mezenterik istasyonların primer tümörün beklenen yayılım güzergâhıyla ilişkisi izlenir.

Önerilen pencereler: Batın (G 400 / M 50), Mediasten (G 350 / M 50), Yumuşak doku (G 400 / M 40).

BT bulguları

• Kısa eksen büyümesi — nodun en uzun çapına dik ölçüm, bulunduğu istasyonun tümör türüne özgü eşikleriyle raporlanır.
• Yuvarlak konfigürasyon — uzun ve kısa eksenlerin birbirine yaklaşması, özellikle bölgesel zincirdeki diğer şüpheli nodlarla birlikte anlam kazanır.
• Santral nekroz — kontrastlanan nodda çevresel kontrastlanmayla ayrışan merkezdeki düşük atenüasyonlu alan; merkezi hipodensite ve periferik kenar kalınlaşması metastatik tutulum açısından şüpheli kabul edilir.
• Heterojen kontrastlanma — nod içinde canlı tümör dokusu, nekroz veya tedaviye bağlı değişikliklerin birlikte oluşturduğu düzensiz atenüasyon.
• Düzensiz nod sınırı — kapsül dışına uzanım veya çevre yağ planında silinme olasılığını düşündürür.
• Nodal konglomerasyon — birbirine komşu nodların ayrı sınırlarının kaybolması; komşu organ ya da damarlarla devamlılık ayrıca kontrol edilir.
• Beklenen drenaj zinciri dışında izlenen nodal tutulum, primer tümörün uzamış drenaj paternini veya gizli bir odak ihtimalini düşündürecek şekilde değerlendirilmelidir.

Normalde

Lenf nodu tutulumunun değerlendirilmesinde boyut kriterleri tek başına yetersizdir; morfolojik özellikler, drenaj paternleri ve karşılaştırma/asimetri ile desteklenen kapsamlı bir yaklaşım tanı doğruluğunu iyileştirir.

Ayırıcı tanı

Reaktif lenfadenopati

enfeksiyon veya inflamasyon nedeniyle büyüyen nodlar genellikle düzgün sınırlı ve homojendir; nekroz gibi agresif özellikler daha çok metastaz veya spesifik enfeksiyonlarla ilişkilidir.

Lenfoma, görüntülemede çok odaklı kitleler şeklinde görülebilir; tek kitle veya infiltratif tutulum da oluşturabilir.

Granülomatöz lenfadenit

özellikle tüberkülozda santral düşük atenüasyon, periferik kontrastlanma ve eşlik eden akciğer ya da peritoneal bulgular metastazı taklit edebilir.

Damar lezyonları, örneğin bronşiyal arter anevrizması, görüntülemede mediastinal lenf nodu metastazını taklit edebilir.

Tuzaklar

• Kısa ekseni küçük diye metastazı dışlamayın; özellikle nekroz, düzensiz sınır veya bilinen primer tümörle uyumlu drenaj zinciri varsa normal boyutlu nod da kuşkuludur.
• Nekrotik merkez ile eksantrik yağlı hilusu karıştırmayın: hilus çoğunlukla yağ atenüasyonunda ve nodun kenarına yakın, nekroz ise nod içinde düzensiz düşük atenüasyonlu alandır.
• Tedavi sonrası kalsifikasyon veya küçülmeyi canlı tümörün tamamen ortadan kalkması olarak yorumlamayın; önceki tetkik ve tedavi öyküsüyle karşılaştırın.
• Birbirine yapışık nodları tek bir organ kitlesi sanmayın; koronal ve sagittal görüntülerde damarları sarma biçimini ve nodal zincirin devamlılığını takip edin.

Kendini dene

1. Akciğer kanseri öyküsü olan bir hastanın abdominal BT'sinde renal hilus düzeyinde 6 mm kısa eksen çapında, düzensiz sınırlı ve santral nekrozu olan paraaortik lenf nodu izleniyor. Bu lenf nodunun evreleme açısından en doğru yorumu aşağıdakilerden hangisidir?

   • Nodun kısa ekseninin 1 cm'den küçük olması metastazı kesin olarak dışlar, reaktif kabul edilmelidir.
   • Santral nekroz yalnızca tüberküloz lenfadenitte görülür, metastaz açısından kuşku uyandırmaz.
   • Morfolojik bozukluklar (nekroz, düzensiz sınır) nodun kısa eksen çapı normal sınırlarda olsa bile metastaz açısından kuşku uyandırır.
   • Para-aortik istasyon akciğer kanserinin beklenen drenaj alanı olmadığı için nod mutlak surette reaktiftir.
   Cevabı göster

   Morfolojik bozukluklar (nekroz, düzensiz sınır) nodun kısa eksen çapı normal sınırlarda olsa bile metastaz açısından kuşku uyandırır.. Lenf nodu metastazı değerlendirmesinde boyut kriterleri tek başına yetersizdir. Özellikle nekroz, düzensiz sınır gibi morfolojik bozukluklar, nodun kısa eksen çapı normal sınırlarda olsa bile metastaz açısından yüksek kuşku uyandırır ve doku örneklemesini gerektirebilir.

2. Baş-boyun kanserinde metastatik servikal lenf nodlarında santral nekroz görülebilir. Kısa eksen ölçümüne dayanarak metastaz dışlanabilir mi?

   • Evet, kısa çap küçükse
   • Hayır, nekroz boyuttan bağımsız kuşkuludur
   • Evet, yağlı hilus varsa
   • Hayır, her servikal nod metastazdır
   Cevabı göster

   Hayır, nekroz boyuttan bağımsız kuşkuludur. Baş-boyun skuamöz hücreli kanserinde nekrotik nod, boyutu küçük olsa da metastaz açısından kuşkuludur. Kısa eksen tek başına duyarlı değildir; yağlı hilus ve nodun diğer morfolojik özellikleri birlikte değerlendirilir. Bu bulgu her nodun metastatik olduğu anlamına gelmez.

Bu konunun yer aldığı turlar

• Onkolojik BT: evreleme ve yanıt değerlendirmesi

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 7 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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