İnce barsak gastrointestinal stromal tümörü

Özet

İnce barsak gastrointestinal stromal tümörü, barsak duvarından gelişen ve sıklıkla lümen dışına doğru büyüyen mezenkimal neoplazidir. Kontrastlı BT, kitleyi barsak kökenine bağlamaya, ekzofitik-intramural uzanımı tanımlamaya ve kanama, nekroz, perforasyon ya da metastatik yayılımı göstermeye yarar. Küçük lezyonlarda barsak distansiyonu yetersizse odak gözden kaçabilir; CT enterografi küçük ince barsak tümörlerinin algılanmasına katkı sağlar. Kitlenin barsak duvarına bağlandığı noktanın veya karaciğer ve peritoneumdaki yayılımın gözden kaçırılması, hastanın doğru evrelenmesini ve komplikasyonların (rüptür gibi) fark edilmesini engeller.

Faz ve pencere

Portal tanısal

Portal venöz kontrastlı BT'de jejunum veya ileum duvarıyla devamlı, intramural ya da ekzofitik yumuşak doku kitle izlenebilir; kontrastlanma homojen veya heterojen olabilir, büyük kitlelerde nekroz, kistik dejenerasyon, kanama, kavite ya da lümene fistül eşlik edebilir.

Kontrastsız

Kontrastsız kesitlerde kitle kas düzeyinde yumuşak doku atenüasyonunda olabilir; kanama veya kalsifikasyon görülebilir, ancak canlı tümör kontrastlanması ve metastaz karakterizasyonu yapılamaz.

BT bulguları

• Jejunum veya ileumla devamlılığı gösterilebilen, lümen dışına büyüyen düzgün konturlu kitle
• Daha küçük odaklarda intramural veya endolüminal yumuşak doku kabarıklığı
• Tümör boyutu arttıkça heterojen kontrastlanma, santral nekroz, kistik dejenerasyon ya da intratümöral kanama
• Ülserasyon ve barsak lümeniyle ileti düşündüren intratümöral gaz veya hava-sıvı seviyesi
• Kitleye komşu ince barsak ansında bası, lümen daralması veya obstrüksiyon
• Tümör rüptürü, hemoperitoneum veya serbest hava
• GIST'te lenf nodu metastazı nadirdir. Evreleme değerlendirmesinde karaciğer ve periton öncelikle incelenir.

Normalde

Normal jejunum ve ileum duvarı ince, lümeni açık ve komşu mezenterden ayrı seçilir; fokal ekzofitik yumuşak doku veya kitleye bağlı ans yer değiştirmesi görülmez. Şüpheli kitlenin duvarla temas ettiği noktayı ardışık aksiyel kesit ve koronal MPR'de izle; duvar devamlılığını, lümene uzanımı, mezenter damarlarıyla ilişkisini ve karaciğer/periton yüzeylerini kıyasla.

Ayırıcı tanı

İnce barsak adenokarsinomu

sıklıkla kısa segmentli duvar kalınlaşması ve omuzlanmalı stenoz yapar; BT'de nodüler kitle veya ülseratif lezyon olarak da görülebilir, ekzofitik büyüme GIST için daha tipiktir.

İnce barsak lenfoması

uzun segmentli duvar tutulumu, anevrizmatik lümen genişlemesi veya çoklu nodlar görülebilir.

Nöroendokrin tümör metastazı

hipervasküler mezenterik kitle ve desmoplastik çekinti primer odaktan daha belirgin olabilir.

İnce barsak metastazı

özellikle hipervasküler primer öyküsünde, birden fazla odak veya belirgin kontrastlanan intramural nodüller yapabilir.

Mezenterik desmoid

mezenterde kitle oluşturur, ancak barsak duvarından köken aldığı izlenimi ve lümenle bağlantısı yoktur.

Tuzaklar

• Ekzofitik kitlenin barsak kökenini gözden kaçırma; tümörün ansla birleştiği duvar noktasını çok düzlemli kesitlerde takip et.
• Heterojen kitlenin santral nekrozunu yalnız sıvı koleksiyonu sanma; çevresel canlı tümör dokusunu, lümene olası iletiyi ve kanamayı kontrol et.
• Küçük intramural GIST'i kollabe ans duvarı veya peristaltik kıvrım sanma; farklı faz/kesitlerde kalıcı fokal kabarıklığı ve CT enterografideki görünümü araştır.
• Lenf düğümü büyümesini GIST yayılımının başlıca paterni varsayma; karaciğer ve peritoneal yüzeylerdeki odakları özellikle incele.
• BT görünümü GIST'in histopatolojik risk sınıflamasını tek başına belirlemez; risk sınıflamaları tümör boyutu, mitotik aktivite, anatomik yerleşim ve perforasyon varlığına dayanır.

Kendini dene

1. Kontrastlı BT'de jejunal ansla devamlı ekzofitik, heterojen kontrastlanan ve nekroz alanları içeren kitle izleniyor. En olası tanı hangisidir?

   • GIST
   • Adenokarsinom
   • Lenfoma
   • Crohn hastalığı
   Cevabı göster

   GIST. Duvarla devamlı ekzofitik büyüme ve heterojen kontrastlanma ile nekroz alanlarının birlikteliği GIST'i düşündürür. Adenokarsinom düzensiz mukozal veya polipoid büyüme ve bazen bağırsak obstrüksiyonuyla; lenfoma ise çoğunlukla sirkumferansiyel duvar kalınlaşması ya da anevrizmatik lümen genişlemesiyle görülebilir.

2. Ailesel adenomatöz polipozis öyküsü olan hastada, jejunal duvarla devamlılığı izlenmeyen ve mezenter kökünde lokal infiltratif solid kitle görülüyor; karaciğer ve peritonda metastatik odak yok. En olası lezyon hangisidir?

   • Mezenterik desmoid (fibromatozis)
   • İnce barsak adenokarsinomu
   • İnce barsak lenfoması
   • İnvajinasyon
   Cevabı göster

   Mezenterik desmoid (fibromatozis). Ailesel adenomatöz polipozis ve mezenter kökenli lokal infiltratif kitle desmoid fibromatozisi destekler; desmoid metastaz yapmaz. İnce barsak GIST'lerinde ekzofitik veya mikst büyüme sık görülür; başlıca metastaz yerleri karaciğer ve peritondur. BT bulguları tanı için ipucu sağlayabilir; kesin tanı ve risk sınıflaması için histopatolojik değerlendirme gerekir.

İlgili konular

• İnce barsak adenokarsinomu

Kaynaklar

Bu sayfadaki 40 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 17 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.