Gastrojejunostomi marjinal ülseri

Özet

Marjinal ülser, gastrojejunostomi sonrasında en sık anastomozun jejunal tarafında veya hemen komşuluğunda gelişen mukozal defekttir. BT, özellikle acil başvuruda ülser çevresindeki fokal duvar değişikliği ve yağlı doku reaksiyonunu fark ettirebilir; perforasyon, koleksiyon ve aktif kanama gibi acil komplikasyonları da araştırır. BT ülseri kesin dışlamak veya mukozal krateri doğrulamak için endoskopinin yerini tutmaz. Perforasyon ya da kanama bulgularının atlanması acil klinik kötüleşmenin tanınmasını geciktirebilir.

Faz ve pencere

Portal tanısal

IV kontrastlı portal venöz kesitlerde gastrojejunostominin özellikle jejunal kenarında fokal duvar kalınlaşması, mukozal düzensizlik veya krater benzeri kontur değişikliği ve perianastomotik yağ çizgilenmesi aranır; perforasyon varsa komşu ekstralüminal gaz veya koleksiyon görülebilir. Bu bulgular mukozal ülseri kesinleştirmez.

Kontrastsız tanısal

BT'de anastomoz kenarında fokal duvar kalınlaşması, mukozal defekt veya çıkıntı ve komşu yağ çizgilenmesi izlenebilir; bu bulgular ülseri kesinleştirmez. BT bulguları ülseri kesinleştirmez; tanıda üst endoskopi altın standarttır ve şüpheli BT bulguları endoskopik değerlendirmeyi gündeme getirmelidir.

Arteriyel tanısal

Aktif kanama şüphesinde BT anjiyografi gastrojejunal anastomozdaki aktif arteriyel kanamayı gösterebilir; lümen içindeki hiperatenuan materyalin kanama olup olmadığını değerlendirmede kontrastsız seri yardımcı olabilir. BT, marjinal ülser tanısında birincil yöntem değildir.

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

BT bulguları

• Anastomozun jejunal kenarında fokal duvar kalınlaşması veya mukozal düzensizlik
• Krater benzeri lümen kontur düzensizliği — BT'de görülebilir; tek başına ülseri doğrulamaz
• Perianastomotik yağlı doku çizgilenmesi — inflamasyonu destekler, ancak BT'de tek başına özgül değildir
• Ülser kenarında fokal ödem veya çevresel duvar kontrastlanması
• Perforasyon işareti — gastrojejunostomi komşuluğunda sınırlı ekstralüminal gaz odağı veya doğrudan lümen duvar kesintisi
• Perianastomotik sıvı, kalın duvarlı koleksiyon ya da fistül traktı — komplike ülseri düşündürür
• Aktif kanama şüphesinde lümen içinde arteriyel kontrast ekstravazasyonu
• Skar ilişkili çıkış daralması ve proksimal poş stazı — kronik ülserin yapısal komplikasyonu olabilir

Normalde

Gastrojejunostomi katlantıları ülseri taklit edebilir; eşlik eden inflamasyonun olmaması, görülen değişikliğin hastanın ağrısının nedeni olma olasılığını azaltır. Gastrojejunostomi katlantıları marjinal ülseri taklit edebilir; eşlik eden inflamasyon yoksa görünüm bir katlantı veya iyileşmiş ülserle ilişkili olabilir.

Ayırıcı tanı

Anastomoz katlantısı

düzgün mukozal çıkıntı yapar; çevresel yağlı doku inflamasyonu ve krater biçimli duvar defekti eşlik etmez.

Gastrojejunostomi darlığı

lümen boyunca sabit daralma ve poş genişlemesi ön plandadır; mukozal ülser krateri şart değildir.

Anastomoz kaçağı

enterik kontrastın lümen dışına geçmesi veya daha yaygın perianastomotik gaz/sıvı görülür; ülserde doğrudan kaçak bulunmayabilir.

Perforasyonsuz peptik ülser

mide/duodenum mukozasında krater ve duvar reaksiyonu vardır; Roux-en-Y anastomoz kenarı hedefi değildir.

Anastomoz nüksü

düzensiz kitle benzeri duvar kalınlaşması veya lenf düğümleri olabilir; önceki kanser cerrahisi öyküsü ve seri incelemeler ayırıcıdır.

Tuzaklar

• BT'de yalnız hafif yağlı doku çizgilenmesi görülebilir; inflamasyonun az olması ülseri dışlamaz ve belirti sürüyorsa endoskopik korelasyon gerekir.
• Anastomoz kıvrımları veya iyileşmiş ülser, mukozal krater izlenimi oluşturabilir; çevresel yağ değişikliği yokluğu ve düzgün katlantı bu taklitçileri destekler.
• Marjinal ülser perforasyonunda gastrojejunostomi alanında gaz odağı görülebilir.
• Arteriyel ekstravazasyon aktif kanama şüphesi olmadan rutin bir ülser işareti değildir; fazı yalnız kanama sorusu klinik olarak varsa yorumla.

Kendini dene

1. Roux-en-Y hastasında BT'de gastrojejunostominin jejunal kenarında fokal kontur düzensizliği ve aynı yerde yağ çizgilenmesi var; lümen dışı kontrast ya da gaz yok. En olası açıklama nedir?

   • Marjinal ülser
   • Gastrojejunostomi katlantısı
   • Mide poşu bezoarı
   • Jejunal divertikül
   Cevabı göster

   Marjinal ülser. Jejunal anastomoz kenarındaki fokal değişiklik ve lokal yağ çizgilenmesi marjinal ülseri destekler; BT bulguları özgül değildir ve mukozal ülserin doğrulanması endoskopiyle yapılır. Katlantı düzgün lümen çıkıntısıdır; bezoar intralüminal kitle, divertikül ise kese biçimli lümen devamlılığı gösterir.

2. Marjinal ülser şüphesi olan hastada BT portal venöz kesitte gastrik poş genişlemesi, anastomoz kenarında duvar kalınlaşması ve komşu yağ çizgilenmesi izleniyor. Bu bulgular en çok aşağıdakilerden hangisini düşündürür?

   • Marjinal ülser
   • İnternal herni
   • Mide kanseri
   • Akut kolesistit
   Cevabı göster

   Marjinal ülser. BT'de gastrik poş genişlemesi, anastomoz kenarında fokal duvar kalınlaşması ve perianastomotik yağ çizgilenmesi marjinal ülseri düşündürür; ancak bu bulgular özgül değildir ve kesin tanı için üst endoskopisi şarttır.

Kaynaklar

Bu sayfadaki 41 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 13 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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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.