Gastrektomi sonrası lokal nüks ve peritoneal yayılım BT bulguları

Özet

Gastrektomi geçirmiş mide kanseri hastasında yeni karın yakınmaları, tümör belirteci artışı veya takip incelemesi sırasında lokal nüks ve peritoneal metastaz araştırılır. BT, anastomoz çevresi ve cerrahi yataktaki nüksü değerlendirmenin yanı sıra peritoneal nodülleri, asiti, lenf nodlarını ve karaciğer metastazlarını göstermeye yardımcı olur. Ameliyat sonrası değişiklikler tümör nüksünü taklit edebildiğinden, BT bulgularının yorumlanması güçleşebilir. BT, küçük hacimli peritoneal karsinomatozun gösterilmesinde daha az duyarlı olabilir; bu hastalık gözden kaçarsa yayılım olduğundan az değerlendirilebilir.

Okuma sırası

gastrojejunal veya özofagojejunal anastomoz. Lokal-bölgesel nüks açısından cerrahi yatağı ve anastomoz çevresini değerlendir.
anastomoz çevresi. Anastomozu çevreleyen dokunun konturunu değerlendir; fokal nodül veya infiltratif yumuşak doku varsa eski incelemedeki aynı bölgeyle büyüme açısından kıyasla.
omentum ve peritoneal yüzey. Cerrahi yatak, omentum ve peritoneal yüzeyleri sistematik biçimde inceleyerek peritoneal nodülleri ara.
periton, karaciğer ve lenf nodları. Son olarak asit, karaciğer odakları ve bölgesel ya da uzak lenf nodlarını aynı evreleme çerçevesinde kontrol et.

Faz ve pencere

Portal tanısal: BT'de lokal-bölgesel nüks kapsamında cerrahi yatak ve anastomoz çevresi; intraabdominal yayılım kapsamında peritoneal nodüller, asit, lenf nodları ve karaciğer metastazları değerlendirilir.

Önerilen pencereler G genişlik, M merkez; değerler Hounsfield birimi (HU)

BatınG 400 / M +50
KaraciğerG 150 / M +30
Yumuşak dokuG 400 / M +40

BT bulguları

Önceki incelemede bulunmayan veya seri incelemelerde büyüyen, cerrahi yatakta düzensiz yumuşak doku
Özofagojejunal ya da gastrojejunal anastomoz komşuluğunda fokal, nodüler veya asimetrik duvar kalınlaşması
Anastomoz çevresi yağ planlarında silinme ve komşu yapılara uzanan infiltratif kontur
Parietal periton, mezenter veya omentum boyunca dağılmış yumuşak doku nodülleri
Omental kekleşme ya da yaygın retiküler omental kalınlaşma
İnce bağırsak ansları arasında veya pelviste yeni, açıklanamayan serbest sıvı
Karaciğerde yeni hipodens metastatik odak veya büyüyen bölgesel/uzak lenf nodu
İnce bağırsak serozası ve mezenter boyunca peritoneal nodüller aranmalıdır; BT küçük hacimli karsinomatozun gösterilmesinde daha az duyarlı olabilir.

Normalde

Aynı rezeksiyon tipinden sonra normal BT'de mide rezeksiyonuna bağlı yeniden düzenlenmiş anatomi ve anastomoz çevresindeki ince, düzgün cerrahi skar beklenebilir; bu görünüm önceki incelemelerde genellikle kararlıdır. Kıyaslamada özellikle anastomoz lümeninin devamlılığı, cerrahi yatak konturu, peritoneal yüzeyler ve omental yağın yeni nodülerleşme gösterip göstermediği incelenir.

Normal BT ile kıyasla

Aynı bölgenin, kaynak veri setinde patoloji içermediği belirtilen bir BT incelemesini kesit kesit kaydırın; organ sınırlarını açarak anatomiyi hasta görüntüsüyle karşılaştırın. Küçük rastlantısal bulgular tümüyle dışlanmamıştır.

Kaynak: TotalSegmentator v2.01 veri seti (Wasserthal ve ark., Radiology: Artificial Intelligence 2023), CC BY 4.0, vaka s0119; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Postoperatif fibrozis: ince, düzgün ve seri incelemelerde değişmeyen yumuşak doku görünümü
Anastomoz ülseri: fokal duvar değişikliği; lümen içi krater ve endoskopik karşılık yardımcı olur
Enfeksiyöz koleksiyon: kontrastlı BT'de çevresel kontrastlanan koleksiyon; bazı kaçak ilişkili koleksiyonlarda hava-sıvı seviyesi görülebilir.
Peritoneal tüberküloz: düzgün periton kalınlaşması, nekrotik lenf nodları veya eşlik eden yaygın bulgular
Desmoid tümör: ameliyat sonrası görüntülemede nüksü taklit edebilen benign bir tümördür.
Postoperatif lokal inflamatuvar değişiklikler peritoneal metastazı taklit edebilir; BT bulguları klinik bulgularla birlikte değerlendirilmelidir.

Tuzaklar

Gastrojejunostomi çevresini değerlendirirken ameliyat sonrası değişmiş anatomiyi ve anastomozun oluşturduğu bağırsak segmentlerini birlikte izle.
Gastrektomi sonrası lokal nüks cerrahi yatakta veya peri-anastomotik alanda görülebilir; değerlendirmede ameliyat tekniğine bağlı görüntüleme farklılıkları göz önünde bulundurulmalıdır.
BT, küçük hacimli peritoneal karsinomatozun gösterilmesinde daha az duyarlı olabilir; bu nedenle küçük implantlar gözden kaçabilir.
Lokal-bölgesel nüks cerrahi yatakta veya peri-anastomotik alanda görülebilir; bu alanları değerlendirirken postoperatif anatomi dikkate alınmalıdır.

Kendini dene

Gastrektomiden sonra gastrojejunal anastomoz yanında yeni büyüyen nodüler doku ve omental implantlar var. En olası açıklama nedir?
Cevabı göster
Lokal nüks ve peritoneal metastaz. Seri incelemede büyüme ve ayrı omental implantlar tümör nüksünü destekler. Peritoneal tüberküloz ile peritoneal karsinomatozun görüntüleme bulguları örtüşebilir; klinik ve radyolojik bulgular birlikte değerlendirilmelidir.
Gastrektomi sonrası BT'de hangi bulgu peritoneal karsinomatoz lehine olabilir?
Cevabı göster
Peritoneal yüzeylerde nodüller. Peritoneal nodüller ve asit BT'de peritoneal karsinomatozu düşündüren bulgular arasındadır.

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 15 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.