Duodenal GİST ve diğer subepitelyal tümörler BT bulguları

Özet

Duodenal GİST ve diğer subepitelyal tümörler, bağırsak duvarından kaynaklanan ve endoluminal veya ekzofitik olarak büyüyebilen kitlelerdir; gastrointestinal kanama, abdominal ağrı veya obstrüksiyon ile belirebilir. Kontrastlı BT kitlenin duodenum duvarıyla ilişkisini, büyüme yönünü ve karaciğer ya da peritoneal yayılımı değerlendirmeyi sağlar; EUS ise özellikle küçük subepitelyal lezyonların duvar katmanı kaynağını belirlemede yardımcı olur. Duodenal subepitelyal lezyonların ayırıcı tanısında GİST, leiomyom ve nöroendokrin tümör gibi farklı histolojiler yer alabilir; görüntüleme özellikleri özgül olmadığından tanı patolojik değerlendirmeyle konur. Pankreas kaynaklı sanılan bir duodenal kitle, hem biyopsi hedefini hem cerrahi planlamayı değiştirebilir.

Faz ve pencere

Portal tanısal: Duodenum duvarından çıkan iyi sınırlı intramural, endoluminal veya ekzofitik kitle ve komşu organlarla ilişkisi gösterilir; büyük GİST'te merkezî düşük atenüasyonlu nekroz, kanama ya da kavite ve çevresel heterojen kontrastlanma görülebilir. Karaciğer odakları ve peritoneal implantlar evreleme için aranır.
Arteriyel: Arteriyel fazda belirgin kontrastlanan duodenal subepitelyal kitlelerde nöroendokrin tümör ve GİST ayırıcı tanıda yer alabilir.

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

BT bulguları

Duodenum duvarından köken alan kitle, multiplanar kesitlerde duvarla devam eden ekzofitik, intramural veya endoluminal komponent olarak değerlendirilmelidir.
Ekzofitik büyüme — kitle duodenum dışına, pankreas başı veya mezenterik köke doğru uzanabilir.
Endoluminal çıkıntı — düzgün sınırlı intraluminal komponent, lümeni kısmen daraltabilir.
Heterojen kontrastlanma — tümör içindeki canlı solid bölümler ile düşük atenüasyonlu nekroz/kanama alanları ayrışır.
GİST'lerde ülserasyon veya merkezi nekroz/kavite nedeniyle kitle içinde veya yüzeyinde düşük atenüasyonlu alanlar görülebilir.
Pankreas başı komşuluğunda kitlenin duodenum duvarıyla ve pankreas parankimiyle ilişkisi değerlendirilmelidir; BT duvar kökenini kesinleştiremeyebilir.
Karaciğer/peritoneal odaklar — metastatik yayılım varsa GİST'te özellikle karaciğer ve peritoneal yüzeylerde aranır.

Normalde

Normal duodenumda duvar ince ve kıvrım boyunca kesintisizdir; lümene uzanan nodül ya da pankreas başına doğru dış kontur kabarıklığı bulunmaz. Normal anatomiyle uyumlu olarak D2, medialde pankreas başı ile komşudur; aralarındaki yağ planı belirgindir. Kıyaslarken kitlenin duodenum duvarıyla devamlılığını ve pankreas başıyla ilişkisini değerlendirin; BT duvar kökenini kesinleştiremeyebilir.

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 s0541; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Duodenal nöroendokrin tümör: küçük endoluminal odak belirgin hipervasküler olabilir; karaciğer metastazları da arteriyel fazda parlak olabilir.
Duodenal adenokarsinom: düzensiz duvar kalınlaşması, ülserasyon ve stenoz baskındır; ekzofitik düzgün kitle daha az tipiktir.
Duodenal leiomyom ve schwannomalar subepitelyal kitle ayırıcı tanısında yer alabilir; bu lezyonların görüntüleme özellikleri GİST ve diğer periduodenal kitlelerle örtüşebildiğinden kesin sınıflama patolojik değerlendirmeye dayanır.
Pankreas başı tümörü: parankim merkezli kitle ve pankreas kanalı/koledok tıkanma paterni kaynak lehinedir.

Tuzaklar

Büyük ekzofitik kitlelerde duodenum duvarı kökeni BT'de belirsiz kalabilir; multiplanar reformasyonlar lezyonun duvarla ilişkisini göstermeye yardımcı olabilir.
Nekroz ve ülserasyon GİST'e özgü değildir; adenokarsinom ve diğer malign kitleler de benzer iç yapı gösterebilir.
Lenf nodu tutulumunun görülmemesi GİST tanısını dışlamaz çünkü GİST'ler genellikle lenfatik yayılım yapmaz; bunun yerine karaciğer ve peritoneal yüzeylerde senkron metastazlar aranmalıdır.

Kendini dene

D3 duvarına bağlı, dışa büyüyen heterojen kitlede merkezî nekroz ve karaciğer odakları var. En olası tümör?
Cevabı göster
Duodenal GİST. Duvar kökenli ekzofitik büyüme, heterojen nekroz ve karaciğer yayılımı GİST'i destekler. Duodenal adenokarsinom duvar kalınlaşması ve lümen deformitesine yol açabilir; adenokarsinom GİST'ten farklı olarak tipik olarak obstrüksiyon yapar.
Duodenal subepitelyal kitlelerde belirgin hiperkontrastlanma görülebilen iki tümör hangisidir?
Cevabı göster
Nöroendokrin tümör ve GİST. Nöroendokrin tümörler ve GİST'ler hiperkontrastlanabilir ve subepitelyal kitle olarak görülebilir.

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 14 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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