Mideye metastaz

Özet

Mide duvarı metastazlarında submukoza sık tutulan başlangıç katmanıdır ve yayılım çoğunlukla hematojen olabilir; peritoneal karsinomatozis serozal yüzeyden mide duvarına ilerleyebilir. Bildirilen primerler arasında meme, akciğer, böbrek hücreli karsinom ve melanom bulunur. BT'de mide metastazı fokal duvar kalınlaşması veya kitle şeklinde görülebilir; bazı metastazlar linitis plastika benzeri diffüz, konsantrik kalınlaşma oluşturur. Kesitsel görüntüleme dağılımı ve eşlik eden metastazları ortaya koyar, ancak primer mide kanserinden kesin ayrım sağlayamaz. Önceden kanser öyküsü olan kişide mide duvarı bulguları metastaz olasılığını da akla getirmelidir; görüntüleme kökeni kesinleştirmediğinden yeterli doku örneklemesi tanı için önemlidir.

Faz ve pencere

Portal tanısal

Submukozal nodül, polipoid duvar odağı, diffüz konsantrik kalınlaşma veya serozal implant aranır; eşlik eden karaciğer, peritoneal ve diğer abdominal metastazlar aynı fazda haritalanır.

Arteriyel

Renal hücreli karsinom ve nöroendokrin kökenli mide metastazları hipervasküler olup arteriyel faza belirgin kontrastlanma gösterebilir.

BT bulguları

• Mide duvarında tek, düzgün sınırlı submukozal nodül; üzerindeki mukozanın BT'de korunmuş görünmesi metastazı dışlamaz
• Birden fazla intramural veya polipoid nodül; odakların sayı ve segment dağılımı primer lezyonla birlikte raporlanır
• Diffüz, simetrik ve konsantrik duvar kalınlaşması ile lümen daralması: linitis plastika benzeri infiltratif örüntü
• Kontrastlı BT’de mide duvarının katmanlı görünümü izlenebilir; bu bulgu tek başına metastazı göstermez ve klinik öykü ile diğer görüntüleme bulguları eşliğinde yorumlanmalıdır.
• Dış duvar boyunca nodüler serozal kalınlaşma, perigastrik yağda implant ve eşlik eden asit
• Böbrek hücreli karsinom veya nöroendokrin primerde arteriyel seride belirginleşen polipoid mide odağı
• Karaciğerde, peritonda, lenf nodlarında veya primer tümör yatağında eşzamanlı metastatik hastalık
• Primer tümör öyküsüyle uyumlu olsa bile, mide odağının histolojik doğrulama gerektirebilecek özgül olmayan görünümü
• Gastrik BT değerlendirmesinde yeterli mide distansiyonu ve çok düzlemli reformasyonlar önemlidir.

Normalde

Normal mide duvarı, yeterli distansiyonda ince, tabakalı ve düzgün konturludur; serozal yüzey boyunca nodül, perigastrik yağda implant veya lümen daralması beklenmez. Şüpheli segmenti komşu normal mideyle karşılaştırarak fokal nodül mü, çevresel rijit kalınlaşma mı olduğunu ve dış yüzeydeki implantları ayırt et.

Ayırıcı tanı

Primer gastrik adenokarsinom, linitis plastika örüntüsünde diffüz infiltratif duvar kalınlaşması ve lümen daralması yapabilir; bu görünüm metastazları taklit edebilir ve BT ile kökeni kesinleştirmek güçtür.

Gastrik GİST

duvar kökenli, sıkça ekzofitik büyüyen, iyi sınırlı kitledir; metastazda çoklu odak, serozal implant veya bilinen primer öne çıkar.

Gastrik lenfoma mide duvarı kalınlaşması ve lenfadenopatiyle görülebilir; kaynaklar lümenin belirgin daralmadan genişleyebileceğini göstermemektedir.

Gastrik nöroendokrin tümörler hipervasküler polipoid kitleseler olarak seyrederek ayırıcı tanıyı zorlaştırabilir.

Linitis plastika tipi primer mide karsinomu

diffüz konsantrik rijit duvar kalınlaşması metastatik infiltrasyonu taklit edebilir; BT tek başına kökeni ayıramaz.

Gastrik lenfoma, mide ve ince bağırsağı sık tutan gastrointestinal lenfomaların görüntülemede değişken görünümlerinden biri olabilir.

Tuzaklar

• Submukozal metastazın üzerinde mukoza normal görünebilir; BT'de yüzeysel ülser olmaması metastaz olasılığını azaltmaz.
• Diffüz konsantrik kalınlaşmayı otomatik olarak primer linitis plastika kabul etme; meme lobüler karsinomu gibi primerlerin öyküsünü ve serozal/peritoneal dağılımı sorgula.
• Mide yeterince distandü değilse fizyolojik katlantılar yalancı duvar kalınlaşması oluşturabilir; fokal asimetriyi komşu kesitlerde izle.
• Melanom mide metastazı yapabilen primerler arasındadır; mide metastazları görüntülemede primer tümörleri taklit edebildiğinden BT görünümü tek başına kökeni kesinleştirmez.

Kendini dene

1. Lobüler meme karsinomu öyküsü olan hastada mide duvarında diffüz kalınlaşma ve serozal nodüller görülüyor. En olası açıklama nedir?

   • Gastrik metastaz
   • Gastrik GİST
   • Glomus tümörü
   • Mide lipomu
   Cevabı göster

   Gastrik metastaz. Lobüler meme karsinomu mide duvarında diffüz, linitis plastika benzeri metastatik tutulum yapabilir ve bu örüntüye peritoneal hastalık eşlik edebilir.

2. Küçük hücreli akciğer karsinomunun mide metastazlarında bildirilen başlıca endoskopik görünüm hangisidir?

   • Mide korpusu veya fundusunda mukozal ya da submukozal kabarıklık; merkezinde ülser bulunabilir
   • Yalnız serozal implant ve normal mide duvarı
   • Yalnız pilor darlığı
   • Mide duvarında yalnız diffüz, ülser içermeyen kalınlaşma
   Cevabı göster

   Mide korpusu veya fundusunda mukozal ya da submukozal kabarıklık; merkezinde ülser bulunabilir. SCLC mide metastazları çoğunlukla korpus veya fundusta mukozal ya da submukozal kabarıklıklar şeklinde bildirilmiş; lezyonların merkezinde ülser bulunabilir. Tanı doku biyopsisi ve immünohistokimyayla doğrulanır.

Kaynaklar

Bu sayfadaki 39 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 11 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.