Glukagonoma

Özet

Glukagonoma, glukagon salgılayan pankreatik nöroendokrin tümördür; nekrolitik migratuvar eritem, yeni başlayan diyabet, kilo kaybı ve tromboembolik eğilim klinik şüpheyi artırabilir. BT, primer tümörün lokalizasyonu ve hastalığın evrelemesinde kullanılır; glukagonomalar çoğunlukla pankreas gövde ve kuyruğunda yer alır, pankreatik nöroendokrin neoplaziler tipik olarak arteriyel fazda belirgin kontrastlanan ve keskin sınırlı kitleler şeklinde görünür. Büyük pankreatik nöroendokrin tümörlerde nekroz veya hemorajiye bağlı heterojen kontrastlanma ve damar invazyonu görülebilir; hormon salgılayan işlevsel tümör tanımı klinik sendrom ve biyokimyasal kanıta dayanır, BT görünümü tek başına bunu göstermez. Karaciğer metastazlarının özellikle arteriyel fazda aranması, yalnız portal fazlı incelemede küçük hipervasküler odakların atlanmasını önler.

Faz ve pencere

Arteriyel tanısal

Pankreas parankim fazında primer nöroendokrin kitle çevre bezden daha yoğun kontrastlanabilir; karaciğerde hipervasküler metastazlar arteriyel kanlanma sırasında belirgin hale gelir. Hem pankreatik odağın hem karaciğer yayılımının saptanmasında temel tanısal fazdır.

Portal tanısal

Primer kitlenin portal venöz fazdaki yoğunluğu ve arteriyel faza göre kontrast değişimi izlenir; BT ile tümörün damar invazyonu ve venöz tromboz açısından yayılımı değerlendirilir. Arteriyel fazda parlak olan metastazlar bu fazda daha silik kalabilir.

BT bulguları

• Pankreas gövde veya kuyruğunda iyi sınırlı, solid, çevre parankimden ayrışan kitle
• Arteriyel fazda belirgin hiperenhansman; büyük lezyonda heterojen kontrastlanma ve santral nekrotik alan
• Tümör sınırında kapsül benzeri düzgün kontur veya komşu parankimde bası etkisi
• Karaciğer parankiminde arteriyel fazda hipervasküler nodüler odaklar ve portal fazda bunların göreli kontrast değişimi
• Portal ven, splenik ven, SMA veya çölyak arterle temas, daralma, sarılma ya da tromboz
• Peripankreatik ve çölyak lenf nodları ile karaciğer dışı uzak metastatik odaklar
• Pankreatik kanal genişlemesi veya distal bez atrofisi olup olmadığı; bu bulgular glukagonoma için zorunlu değildir
• Pankreas nöroendokrin neoplazileri hipervasküler olduklarından arteriyel fazda daha iyi saptanabilir; karaciğer ve pankreasın değerlendirilmesinde kontrastlı MR tercih edilir.

Normalde

Arteriyel fazda çevre pankreas parankimi karşılaştırma zemini olarak alınır; pankreatik nöroendokrin neoplaziler tipik olarak bu parankime göre daha belirgin kontrastlanır. Aynı düzeyde lezyonun bezden daha yoğun kontrastlanmasını, tümör çevresindeki normal parankim sınırını ve karaciğerin portal faz görüntüsüyle arteriyel odaklarını karşılaştır.

Ayırıcı tanı

İnsülinoma

çoğunlukla küçük, iyi sınırlı hipervasküler pankreatik nöroendokrin tümördür; klinik ayırım hipoglisemi ve biyokimyasal hormon profiliyle yapılır.

Nonfonksiyonel pankreatik nöroendokrin tümör

aynı arteriyel hiperenhansman paternini gösterebilir; hormon sendromu ve biyokimyasal bulgu olmadan glukagonoma denemez.

Pankreatik duktal adenokarsinom

genellikle hipoenhansman, infiltratif kenar ve kanal tıkanmasına bağlı upstream genişleme veya atrofi gösterir.

Solid psödopapiller neoplazi

özellikle ergen kızlarda ve genç kadınlarda görülür; kapsüllü solid-kistik kitle şeklinde olabilir ve hemorajik ya da dejeneratif alanlar içerebilir.

Pankreasa metastaz

böbrek hücreli karsinom gibi hipervasküler primerlerden gelen metastazlar pankreatik NET'i taklit edebilir; bilinen primer tümör ve çok odaklı dağılım sorgulanır.

Tuzaklar

• Hipervasküler pankreas kitlesi glukagonoma alt tipini kanıtlamaz; radyolojik görünüm nöroendokrin tümör olasılığını destekler, hormon salgısı klinik ve laboratuvarla doğrulanır.
• Portal fazda silikleşen hipervasküler karaciğer metastazı gözden kaçabilir; karaciğeri arteriyel görüntülerde ayrıca tara.
• Bazı pankreatik nöroendokrin tümörler, özellikle nonfonksiyonel olanlar, hipovasküler veya heterojen olabilir; hiperenhansmanın yokluğu tümörü dışlamaz.
• Karaciğer arteriyel fazında geçici perfüzyon farklılığı metastazı taklit edebilir; odağın portal fazdaki karşılığını, şekil kalıcılığını ve diğer lezyonları kontrol et.
• Arteriyel fazda saptanan karaciğer odağının değerlendirilmesinde kontrastlı MR tercih edilir.

Kendini dene

1. Diyabet ve nekrolitik migratuvar eritemi olan hastada pankreas kuyruğunda arteriyel hiperenhans kitle, karaciğerde benzer odaklar görülüyor. En olası tanı nedir?

   • Glukagonoma
   • İnsülinoma
   • Duktal adenokarsinom
   • Solid psödopapiller neoplazi
   Cevabı göster

   Glukagonoma. Klinik glukagon fazlalığı bulguları ve hipervasküler pankreatik kitle glukagonomayı düşündürür; karaciğer odakları metastaz olabilir. İnsülinoma hipoglisemiyle ilişkilidir; duktal adenokarsinom genellikle hipoenhans ve infiltratiftir; solid psödopapiller neoplazi çoğunlukla solid-kistik morfoloji gösterir.

2. Pankreasta hipervasküler kitleye arteriyel fazda belirgin kontrastlanan karaciğer nodülleri eşlik ediyor. Karaciğer nodülleri için en uygun yorum hangisidir?

   • Nöroendokrin tümör metastazı olasıdır; ancak patern primer kökeni tek başına kanıtlamaz
   • Patern kolorektal kanser metastazına özgüdür
   • Nodüller kesinlikle basit kisttir
   • Arteriyel hipervaskülarite metastazı dışlar
   Cevabı göster

   Nöroendokrin tümör metastazı olasıdır; ancak patern primer kökeni tek başına kanıtlamaz. Hipervasküler pankreatik kitleyle birlikte arteriyel hipervasküler karaciğer nodülleri nöroendokrin tümör metastazını düşündürür; renal hücreli karsinom gibi başka hipervasküler metastazlar da benzer görünebildiğinden patern tek başına kökeni kanıtlamaz.

İlgili konular

• Nonfonksiyonel pankreatik nöroendokrin tümör

Kaynaklar

Bu sayfadaki 41 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.