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Meme kanserinde aksiller ve bölgesel nodal yayılım

Regional nodal spread of breast cancer

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Meme kanserinde aksiller ve bölgesel nodal yayılım: yayımlanmış olgu görüntüsü, aksiyel kesit

4 adım

Görüntü: Ming Y, Wu N, Qian T ve ark., “Progress and Future Trends in PET/CT and PET/MRI Molecular Imaging Approaches for Breast Cancer.” 2020, Figure 3. PMC7435066 · doi:10.3389/fonc.2020.01301 · CC BY 4.0. Değişiklik: kırpıldı, yeniden boyutlandırıldı, odak işaretleri eklendi.

Özet

Meme kanseri, başta aynı taraf aksiller nodlar olmak üzere internal mammary ve supraklaviküler bölgesel lenfatik istasyonlara yayılabilir. Kontrastlı toraks BT bu zincirleri ve eşlik eden göğüs içi hastalığı birlikte gösterir, ancak küçük hacimli nodal metastazı dışlayamaz ve nodal evreyi tek başına doğrulamaz. Morfoloji, taraf, nodların dağılımı ve primer meme bulgusuyla uyum birlikte değerlendirilmelidir. Şüpheli bölgesel nodların gözden kaçması hastalık yaygınlığının eksik bildirilmesine yol açabilir.

Faz ve pencere

Portal tanısal
Kontrastlı toraks BT'de aksiller seviyeler, infraklaviküler alan, internal mammary zincir ve supraklaviküler fossadaki nodların kısa ekseni, oval/yuvarlak biçimi, yağlı hilus seçilebilirliği ve çevre yağ planı incelenir. Heterojen kontrastlanan, yuvarlaklaşmış veya perinodal sınırlanması bozulmuş nodlar şüphe uyandırır; normal boyuttaki nodda mikrometastaz dışlanamaz.

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

BT bulguları

  • Yuvarlak nod morfolojisi — uzun ekseni baskın oval nod yerine kısa ve yuvarlak konturlu nod şüphe uyandırır; boyut tek başına yeterli değildir.
  • Yağlı hilus kaybı — normal nod içindeki yağlı merkez seçilemez veya tüm nod homojen yumuşak doku atenüasyonuna dönüşür.
  • Kortikal asimetri — kalın ve eksantrik yumuşak doku komponenti, düzgün ince korteksli oval noddan ayrılır.
  • BT’nin primer nodal evrelemedeki sınırlı rolü ve orta duyarlılık, düşük özgüllüğü nedeniyle nod içi düşük atenüasyon veya heterojen kontrastlanma tek başına metastazı doğrulamaz.
  • Perinodal yayılım — BT’de aksiller nod metastazının değerlendirilmesinde duyarlılık orta, özgüllük düşüktür; bu nedenle çevre yağ planındaki değişiklik tek başına kapsül dışı hastalığı doğrulamaz.
  • İpsilateral çoklu nod dağılımı — meme bulgusuyla aynı tarafta birden fazla şüpheli aksiller nod bölgesel yayılım paternini destekler.
  • Ek bölgesel istasyonlar — internal mammary zincir, infraklaviküler ve supraklaviküler nodları aksilla dışında ayrıca tarayın.

Normalde

Normal aksiller nodlar çoğunlukla oval, düzgün sınırlı, ince korteksli ve korunmuş yağlı hilusludur; iki taraf arasında hafif boyut farkı tek başına hastalık anlamına gelmez. Meme kanserinin bölgesel lenfatik havzaları aksilla, internal mammary ve supraklaviküler bölgeleri içerir. Aksiller nodlarda şekil, korteks, sınırlar ve yağlı hilusu değerlendirin.

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 s0975; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Reaktif lenf nodu
enfeksiyon veya aşı sonrası genellikle korunmuş yağlı hiluslu oval nodlar görülebilir; dağılım klinik bağlam ve önceki incelemeyle karşılaştırılır.
Lenfoma
birden fazla nodal istasyonda homojen büyümüş nodlar ve eşlik eden mediastinal zincir tutulumu olabilir; bilinen meme primeri ve nodal morfoloji ayrımda önemlidir.
Tüberküloz lenfadeniti meme kanseriyle eşzamanlı nodal hastalığı taklit edebilir; ayrımda klinik değerlendirme ve gerektiğinde histopatolojik doğrulama önemlidir.
Aşı ilişkili aksiller adenopati
çoğu kez yakın dönem aşı yapılan tarafta ve reaktif morfolojide görülür; zaman ilişkisi ve karşı meme/aksilla bulguları sorgulanır.
Silikon lenfadenopatisi, implant rüptürü veya silikon göçüyle ilişkili olup meme kanseri metastazını taklit edebilir; US'deki “snowstorm” bulgusu ve MRG silikon göçünü göstermeye yardımcı olur, histopatoloji tanıyı doğrulayabilir.

Tuzaklar

  • Kısa eksen boyutunu tek başına metastaz ölçütü saymayın; küçük metastatik nodlar olabilir, büyük reaktif nodlar da görülebilir.
  • Tek taraf aksiller nodu aşı öyküsünü ve kol/meme enfeksiyonunu sormadan metastaz diye etiketlemeyin; fakat bilinen primerde morfolojik şüpheyi de boyut normal diye yok saymayın.
  • Internal mammary zinciri aksilladan ayrı bir drenaj yolu olarak değerlendirin; internal mammary arter ve ven boyunca, sternum kenarına yakın seyreder.
  • BT'nin yağlı hilusu sınırlı uzaysal çözünürlük veya kısmi hacim etkisiyle seçemeyebileceğini hesaba katın; şüpheyi tanı doğrulaması olarak sunmayın.

Kendini dene

  1. Bilinen sağ meme tümörüyle aynı tarafta hilusu silinmiş, yuvarlak aksiller nod ve internal mammary nod var. En olası açıklama nedir?

    Cevabı göster

    Bölgesel nodal metastaz. Primerle aynı tarafta iki bölgesel istasyonda şüpheli morfoloji yayılım olasılığını yükseltir. Aşı ve enfeksiyon çoğunlukla reaktif bağlamla, silikon lenfadenopatisi implant ilişkili bulgularla desteklenir; görüntüleme bulguları histolojik doğrulamanın yerine geçmez.

  2. Aksiller nod büyümüş ancak oval, düzgün sınırlı ve yağlı hilusu korunmuş; yakın zamanda aynı koldan aşı yapılmış. En olası seçenek nedir?

    Cevabı göster

    Reaktif lenf nodu. Korunmuş hilus ve oval biçim, aşı sonrası uygun taraf-zaman ilişkisiyle reaktif nodu destekler. Metastaz ve lenfomada morfoloji veya diğer nodal istasyonlar şüphe uyandırabilir; silikon nodu için implant/silikon göçü bağlamı gerekir.

İlgili konular

Kaynaklar

Bu sayfadaki 38 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 7 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez, tıbbi tavsiye değildir. Metinler yapay zekâ desteğiyle yazıldı ve otomatik bir adımda kaynak alıntılarıyla karşılaştırıldı; bu bir tıbbi doğrulama değildir ve içerik uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.