Duodenal iskemi ve infarkt

Özet

Duodenal iskemi, zengin kollateral kanlanması nedeniyle nadir görülen bir tablodur. Şüpheli mezenterik bağırsak iskemisinde MDCTA, arteriyel ve venöz trombozu ve tutulan gastrointestinal traktın kapsamını değerlendirmede tercih edilen tetkiktir. BT, bağırsak iskemisinde damar tıkanıklığını ve tutulan gastrointestinal bölgenin kapsamını değerlendirmeye yardımcı olur. Duodenal nekroz nadir, hızla ilerleyebilen ve ölümcül olabilen bir durumdur; bu nedenle erken tanınması önemlidir.

Faz ve pencere

Kontrastsız

Duvar içi kanama kontrastsız seride yüksek atenüasyonlu mural kalınlaşma olarak görünebilir.

BTA tanısal

Çölyak arter, SMA, gastroduodenal arter ve izlenebilen pankreatikoduodenal dallarda dolum kesintisi, trombüs, ileri darlık ve kollateral akım araştırılır; duodenal duvarın komşu canlı bağırsak segmentlerine göre daha az kontrastlanması eşlik edebilir.

Portal tanısal

Duodenum mukozasının ve tüm duvarının kontrastlanması komşu normal bağırsakla kıyaslanır; segmental hipoenhans, duvar ödemi veya heterojen kontrastlanma ile mezenterik venöz gaz ve venöz dolum defekti değerlendirilir.

Önerilen pencereler: Batın (G 400 / M 50), Yumuşak doku (G 400 / M 40), Anjiyo (G 600 / M 150), Akciğer (G 1500 / M -600).

BT bulguları

• Segmental mukozal hipoenhans — D1-D4'ün bir bölümünde mukoza, aynı serideki canlı jejunal anslara kıyasla silik veya kontrastsız görünür.
• Duvar kalınlaşması ve submukozal ödem — submukoza düşük atenüasyonlu, mukoza ve dış duvar daha belirgin olduğunda katmanlı hedef görünümü oluşabilir.
• Az kontrastlanan ve ödemli duvar — ileri arteriyel akım kaybında duvar kalınlaşması ve hedef görünümü (target sign), mukozanın silik veya kontrastsız kalması ile karakterizedir.
• Duodenal pnömatozis — duvar katları içinde çizgisel ya da kabarcıklı gaz odakları; duvar kontrastlanma kaybı ve portal venöz gazla birlikteliği infarkt kuşkusunu artırır.
• Pankreatikoduodenal arteriyel arkadda kesinti — çölyak-gastroduodenal sistem ile SMA kaynaklı inferior pankreatikoduodenal dallar arasındaki bağlantıların dolumu azalır veya kesilir.
• Periduodenal mezenterik ödem ve sıvı — pankreas başı komşuluğunda yağ dokusu bulanıklaşır, fasya belirginleşir veya komşu mezenterik yapraklar arasında sıvı birikir.
• Portomezenterik venöz gaz — mezenterik ven dalları ya da karaciğerin periferik portal dallarında dallanan hava odakları görülür; tek başına duodenal infarktı kanıtlamaz.
• Duodenum çevresindeki ekstraluminal hava, özellikle periduodenal sıvı veya duvar kalınlaşmasıyla birlikteyse perforasyonu düşündürür.

Normalde

Çok detektörlü BT, duodenum ve çevre organların kapsamlı değerlendirilmesini sağlar; yetersiz duodenal distansiyon, ince anormallikleri gizleyebilir. Şüpheli duodenal segmentte duvar ödemi ve kontrastlanma azalması değerlendirilmelidir; duodenum pankreatikoduodenal arteriyel arkadlardan kanlanır.

Ayırıcı tanı

Akut duodenit

duvar kalınlaşması ve mukoza hiperemisi olabilir; belirgin segmental hipoenhans ve uyumlu arteriyel akım kesintisi tipik değildir.

Duodenal Crohn hastalığı

asimetrik, sıçrayıcı kalınlaşma, kıvrım düzensizliği, fistül veya başka bağırsak segmentlerinde inflamasyon iskemi yerine Crohn'u destekler.

Pankreatite bağlı duodenal değişiklik

duvar bulgusu pankreas başı ödemi ve peripankreatik sıvıyla doğrudan komşuluk gösterir.

Duodenal intramural hematom

kontrastsız seride duvar içinde yüksek atenüasyon ve lümeni daraltan mural kalınlaşma izlenir.

Peptik ülser perforasyonu

bulbusta fokal ülser krateri, çevresel inflamasyon ve ekstraluminal gaz öne çıkar; damar alanına uyan uzun segmentli hipoenhans beklenmez.

Tuzaklar

• Duodenumun zengin kollateral ağı izole damar oklüzyonuna karşı koruyucudur; yalnız ana çölyak veya SMA gövdesine bakıp gastroduodenal-pankreatikoduodenal bağlantıları atlamayın.
• İskemik bağırsak bulguları örtüşebilir ve tekil görüntüleme bulguları özgül olmayabilir; geri dönüşümlü değişiklik ile transmural nekrozun ayrımında bulgular birlikte değerlendirilmelidir.
• Pnömatozis iyi huylu nedenlerle de görülebilir; izole duvar gazı yerine eşlik eden hipoenhans, portomezenterik gaz, sıvı ve klinik bağlamı arayın.
• Lümen içindeki gaz, özellikle duodenum kıvrımlarında duvar gazını taklit edebilir; akciğer penceresinde gazın duvar katları içinde devam edip etmediğini ve lümendeki içerikle ilişkisini kontrol edin.

Kendini dene

1. D2 duodenum duvarında belirgin kontrastlanma azalması ve ödem görülüyor. En olası tanı hangisidir?

   • Duodenal iskemi
   • Akut duodenit
   • Pankreatit
   • İntramural hematom
   Cevabı göster

   Duodenal iskemi. Duodenal duvar ödemiyle birlikte belirgin kontrastlanma azalması duodenal iskemi lehine BT bulgusudur.

2. D3 duvarında küçük gaz odakları var; duvar kontrastlanması korunmuş, damarlar açık ve periduodenal sıvı yok. En uygun olası açıklama hangisidir?

   • Benign pnömatozis
   • Duodenal infarkt
   • Crohn hastalığı
   • Peptik ülser
   Cevabı göster

   Benign pnömatozis. İzole duvar gazı iskemiye özgü değildir; korunmuş perfüzyon ve eşlik eden ağır duvar ya da mezenter bulgusu bulunmaması benign pnömatozisi olası kılar. İnfarktta perfüzyon kusuru beklenir; Crohn'da inflamatuvar dağılım ve peptik ülserde fokal ülser odağı aranır.

Kaynaklar

Bu sayfadaki 39 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 10 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.