Duodenal adenokarsinom

Özet

Duodenal adenokarsinom özgül olmayan yakınmalarla ortaya çıkabilir; kilo kaybı, anemi veya gastrointestinal kanama bulunan hastalarda ayırıcı tanıda düşünülmelidir. Kontrastlı BT, tümörün duodenumdaki segmentini ve çevre damarlarla, bölgesel lenf nodlarıyla ve komşu pankreatikoduodenal yapılarla ilişkisini gösterir; izodens veya küçük tümörler BT'de gözden kaçabilir. Darlık ve proksimal mide-duodenum genişlemesi obstrüksiyonun düzeyini gösterirken, karaciğer ve peritoneal yayılım da evreleme incelemesinde aranır. Duodenal adenokarsinomun pankreas, ampulla veya distal safra yolundan kaynaklanan periampuller tümörlerden ayırt edilmesi zor olabilir; doğru lokalizasyon cerrahi strateji ve prognoz açısından önemlidir.

Faz ve pencere

Portal tanısal

Duodenal adenokarsinom BT'de kontrastlanan duvar kalınlaşması, annüler daralma ya da polipoid veya ülseratif kitle şeklinde görülebilir; tümör kontrastlanması sağlıklı duodenum duvarıyla karşılaştırılır. Pankreas başı ve ampulla, bölgesel lenf nodları, karaciğer ve peritoneal yüzey aynı incelemede değerlendirilir.

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

BT bulguları

• Düzensiz kısa segment duvar kalınlaşması — normal duvar konturunu bozan asimetrik solid doku.
• Ülserli veya polipoid kitle — lümen içine uzanabilir, yüzeyinde kontrastlı oral içerik ya da gazla ilişkili krater görülebilir.
• Lümen stenozu — tümör düzeyinde daralma ve yukarı akımda duodenum veya mide genişlemesi.
• Pankreatikoduodenal oluk tutulumu — duvar kitlesinin pankreas başı konturuyla ilişkisi ve aradaki yağ planı izlenir.
• Ampuller uzanım — distal koledok ve ana pankreas kanalında eşlik eden genişleme görülebilir.
• Bölgesel nodlar — periduodenal ve pankreatikoduodenal zincirde şüpheli morfolojili lenf nodları.
• Uzak yayılım — karaciğer odakları, peritoneal nodüller veya asit ileri hastalık bulgusu olabilir.
• Rezektabilite değerlendirmesinde tümörün çevre organlarla ilişkisini ve çölyak trunkus, mezenterik ve hepatik damarlar ile portal ve inferior vena kava dahil komşu damarlarla temasını inceleyin.

Normalde

Normal D2-D4 duvarı distansiyon yeterliyse ince, düzgün ve çevre yağ planından seçilebilir; lümen kesintisiz devam eder. Pankreas başı oluğun içinde düzgün konturlu görünür, distal koledok ile pankreas kanalı belirgin geniş değildir. Kıyaslamada kalınlaşmanın fokal/asimetrik olup olmadığına, darlık sonrası genişlemeye ve duvar-pankreas arasındaki yağ planının kaybına bakın.

Ayırıcı tanı

Pankreas başı adenokarsinomu

kitle merkezinin pankreas parankiminde olması ve pankreas kanalı/koledok tıkanma bulguları kaynak lehinedir.

Ampulla Vater tümörü

papilla çevresinde küçük merkez ve distal safra/pankreas kanallarında genişleme öne çıkar.

Duodenal lenfoma

daha uzun segmentli, homojen kalınlaşma ve lümenin daralma yerine genişlemesi görülebilir.

Duodenal GİST

duvar kökenli, sıklıkla ekzofitik kitle; daha büyük lezyonlarda nekroz ve heterojen kontrastlanma görülebilir.

Groove pankreatiti

pankreatikoduodenal olukta inflamatuvar doku ve duvar kistik değişiklikleri tümörü taklit edebilir.

Tuzaklar

• Duodenal adenokarsinom BT'de düzensiz duvar kalınlaşmasıyla lümen deformitesine neden olabilir.
• Periampuller tümörlerin duodenum, ampulla, pankreas başı veya distal koledok kaynaklı olup olmadığını BT'de ayırt etmek güç olabilir; D2'nin medial duvarını, papillayı ve safra-pankreas kanallarındaki dilatasyonu birlikte değerlendirin.
• Küçük yüzeyel adenokarsinom rutin BT'de seçilmeyebilir; negatif BT mukozal hastalığı dışlamaz.
• Rutin kontrastlı BT'de primer tümörün T ve bölgesel nodların N evrelemesi eksik kalabilir; izodens veya küçük lezyonlarda tümör yaygınlığını ve rezektabiliteyi yalnız BT bulgusuyla kesinleştirmeyin.

Kendini dene

1. Portal faz BT'de D2'de kısa düzensiz stenoz, pankreas başı korunmuş ve proksimal lümen geniş. En olası tanı?

   • Duodenal adenokarsinom
   • Groove pankreatiti
   • Duodenal lenfoma
   • Duodenal GİST
   Cevabı göster

   Duodenal adenokarsinom. Kısa, düzensiz duvar kaynaklı stenoz adenokarsinomla uyumludur. Groove pankreatitinde oluk merkezli inflamasyon; lenfomada daha yaygın kalınlaşma ve genişleme; GİST'te çoğu kez ekzofitik kitle beklenir.

2. Duodenal adenokarsinom ile duodenal lenfoma arasındaki kaynakta belirtilen tipik BT farkı hangisidir?

   • Adenokarsinom tipik olarak obstrüksiyona yol açar.
   • Adenokarsinom tipik olarak obstrüksiyona yol açmaz.
   • Adenokarsinom yalnızca duodenum dışında kistik kitle oluşturur.
   • Adenokarsinom tipik olarak lümen genişlemesine yol açar.
   Cevabı göster

   Adenokarsinom tipik olarak obstrüksiyona yol açar.. Kaynak, adenokarsinomun lenfomadan farklı olarak tipik biçimde obstrüksiyona yol açtığını belirtir.

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 9 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.