Kolon ve rektum nöroendokrin tümörü

Özet

Kolorektal nöroendokrin tümörler (NET), çoğu kez endoskopide fark edilen mukozal veya submukozal lezyonlardır; rektum sık yerleşim alanıdır. BT, küçük yüzeyel primeri göstermede sınırlıdır ve rektum duvarı katmanlarını değerlendirmede MR ya da endoskopik ultrasonun yerini tutmaz. Kontrastlı toraks, abdomen ve pelvis BT, ileri tümörlerde bölgesel nodları ve karaciğer gibi uzak yayılım alanlarını araştırır. Küçük hipervasküler karaciğer odaklarını veya mezorektal yayılımı atlamak evreyi eksik gösterebilir.

Okuma sırası

1. rektum duvarı. Rektum orta kesiminin duvarını saat kadranı boyunca izle; asimetrik kalınlaşma veya lümene kabaran yumuşak doku odağını bul.
2. mezorektal yağ ve fasya. Odağın dış sınırını mezorektal yağla karşılaştır; yağ planındaki spikülasyon ve fasya yönündeki uzanımı göster.
3. mezorektal lenf nodları. Mezorektal lenf nodlarını incele; rektal NET'lerde kısa çapı >5 mm olan yuvarlak nodlar bildirilmiştir.
4. kolon, periton ve karaciğer. Son olarak kolon tıkanıklığını, peritoneal nodülleri ve karaciğerin arteriyel/portal görüntülerindeki uzak odakları tara.

Faz ve pencere

Portal tanısal

Kontrastlı abdomen-pelvis kesitlerinde primer alanı, mezorektal/perikolik yumuşak doku nodlarını ve karaciğer metastazlarını ara; nodal ya da primer lezyon belirgin kontrastlanabilir.

Arteriyel tanısal

Eşlik eden hipervasküler karaciğer metastazları, portal fazda silikleşebilecekleri için arteriyel görüntülerde belirgin odaklar olarak seçilebilir.

Önerilen pencereler: Batın (G 400 / M 50), Karaciğer (G 150 / M 30), Yumuşak doku (G 400 / M 40).

BT bulguları

• Rektum veya kolonda fokal duvar kalınlaşması ya da lümene uzanan yumuşak doku; küçük mukozal NET normal kalınlıktaki duvar içinde BT'de seçilemeyebilir.
• Rektum çevresinde mezorektal fasya yönünde uzanan spiküle doku veya komşu organ planlarında silinme, lokal ileri hastalık kuşkusunu artırır.
• Rektal NET'lerde transrektal ultrasonda kısa çapı >5 mm olan yuvarlak lenf nodları bildirilmiştir.
• Karaciğerde arteriyel fazda çevre parankime göre belirgin kontrastlanan, portal fazda izoatenüe hale gelebilen çoklu odaklar.
• İleri hastalıkta karaciğer metastazları ve bölgesel mezorektal lenf nodları aranır; peritoneal nodüller kolorektal NET'lerde nadirdir.
• Kolon lümenindeki kitleye bağlı proksimal kolonda genişleme, mekanik obstrüksiyon açısından değerlendirilmelidir.

Ölçütler ve sınıflamalar

WHO sindirim sistemi NET derecelendirmesi

WHO sindirim sistemi tümörleri 6. baskı (2026): NET derecesi mitoz sayısı ve Ki-67 ile belirlenir; G1: <2 mitoz/2 mm² ve Ki-67 <%3; G2: 2–20 mitoz/2 mm² veya Ki-67 %3–20; G3: >20 mitoz/2 mm² veya Ki-67 >%20. Derecelendirme, mitoz indeksi ve/veya Ki-67 gösterge değerine göre belirlenir. İyi diferansiye NET G3, kötü diferansiye NEC’den morfolojik olarak ayrıdır; derece BT’den verilemez.

Normalde

Normal rektumda duvar ince ve düzenli kalınlıkta, mezorektal yağ homojen, mezorektal fasya kesintisiz görünür; perikolik yağ planları ve bölgesel nodlar belirgin kitle oluşturmaz. Aynı anatomik seviyede asimetrik duvar dokusunu, mezorektal nodları ve karaciğer segmentlerinde arteriyel-parankimal kontrast farkını karşılaştır.

Ayırıcı tanı

Kolorektal adenokarsinom

düzensiz annüler daralma ve omuzlanma yapabilir; BT histolojik alt tipi güvenle ayıramaz.

Gastrointestinal stromal tümör

barsak duvarından çıkan ekzofitik veya intraluminal kitle oluşturabilir; BT'de heterojen kontrastlanma ve nekroz gösterebilir.

Lenfoma

barsak duvarında kalınlaşma ve nodal tutulum yapabilir; histopatolojik değerlendirme gereklidir.

Polip ile ayırt edilir; submukoza yerleşimli olması ve düz kas tabakasına invazyon düzeyi ayırıcı tanıda ve tedavide belirleyicidir.

Tuzaklar

• Küçük rektal NET'i normal rektum BT'sinde dışlamak mümkün değildir; endoskopi, endoskopik ultrason ve uygun pelvis MR bulguları ayrı değerlendirilmelidir.
• Portal fazda izoatenüe hipervasküler karaciğer metastazı gözden kaçabilir; mevcutsa arteriyel fazı aynı segmentte karşılaştır.
• Çoklu rektal NET'lerde mezorektal lenf nodu metastazı riski, tek başına boyuttan ziyade tümör sayısı ve primer tümör özellikleriyle birlikte değerlendirilebilir.

Kendini dene

1. Endoskopide küçük rektal NET saptanan hastada BT'nin en güvenilir katkısı hangisidir?

   • Mukozal invazyon derinliği
   • Bölgesel ve uzak yayılım
   • Hücre farklılaşma derecesi
   • Ki-67 proliferasyon indeksi
   Cevabı göster

   Bölgesel ve uzak yayılım. BT'nin temel rolü ileri hastalıkta bölgesel ve uzak metastazları araştırmaktır. Küçük lezyonun duvar katmanlarına yayılımı için endoskopik ultrason veya MR, derece ve Ki-67 için patoloji gerekir.

2. Bilinen rektal NET’li hastada yeni çoklu solid karaciğer nodülleri arteriyel fazda belirgin kontrastlanıyor, portal fazda silikleşiyor ve periferik nodüler-santripetal dolum göstermiyor. En olası açıklama nedir?

   • Basit kist
   • Hemanjiyom
   • NET metastazı
   • Fokal yağlanma
   Cevabı göster

   NET metastazı. Bilinen rektal NET bağlamında çoklu solid ve arteriyel fazda belirgin nodüller metastazı destekler. Hemanjiom için beklenen periferik nodüler başlayıp santripetal ilerleyen dolum paterni tarif edilmemiştir; kist ve fokal yağlanma solid hipervasküler nodül görünümünü vermez.

İlgili konular

• Nöroendokrin tümör karaciğer metastazları
• Nöroendokrin tümör peritoneal ve nodal yayılımı

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 8 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez. İçerik yapay zekâ destekli bir süreçle güncel literatüre göre cümle cümle kaynaklarla karşılaştırıldı, ancak uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.