Seminomda retroperitoneal ve torasik yayılım

Özet

Seminom, testis germ hücrelerinden köken alan malign bir tümördür ve retroperitoneal lenf nodu metastazı sık görülür. Kontrastlı BT, özellikle paraaortik ve interaortokaval nodların dağılımını, boyutunu ve torasik yayılımı göstererek evrelemeyi tamamlar. Seminomla ilişkili retroperitoneal kitle heterojen olabilir ve büyük lobülasyonlarında santral nekrotik alan içerebilir; BT görünümü tek başına histolojik tanıyı doğrulamaz. Retroperitoneal lenf nodlarının ölçüm yöntemi ve boyutu evrelemeyi etkileyebilir; farklı ölçüm eksenleri bazı hastaların daha ileri evrede sınıflandırılmasına yol açabilir.

Faz ve pencere

Portal tanısal

Kontrastlı abdomen-pelvis BT'de paraaortik veya interaortokaval yumuşak doku nodları, homojen kontrastlanma ya da büyük odaklarda santral düşük atenüasyon/nekroz değerlendirilir. Evreleme kapsamında toraks BT çekilebilir; seminomda akciğer metastazları bu incelemede görülebilir.

Önerilen pencereler: Batın (G 400 / M 50), Mediasten (G 350 / M 50), Akciğer (G 1500 / M -600).

BT bulguları

• Testis seminomunda retroperitoneal lenf nodları metastaz alanı olabilir.
• Nodal hastalık aort çevresinde lobüle, düzgün sınırlı yumuşak doku nodları veya birleşen kitle şeklinde görülebilir.
• Seminomla ilişkili retroperitoneal kitlelerde heterojenite ve santral nekroz görülebilir; bu bulgular seminom olasılığını dışlamaz.
• İleri retroperitoneal hastalıkta üreteral obstrüksiyon eşlik edebilir; bildirilen bir olguda idrar drenajı için bilateral üreter stenti ve sol nefrostomi gerekmiştir.
• İleri yayılımda mediastinal ve supraklaviküler lenf nodu tutulumu görülebilir.
• Akciğer parankim nodülleri veya kitleleri lenfatik yayılımın ötesinde uzak metastatik hastalığa işaret edebilir.

Ölçütler ve sınıflamalar

BT'de şüpheli nod için kullanılan kısa eksen eşiği (tek başına tanı koydurmaz)

Beklenen drenaj zincirindeki nodların ölçüm yöntemleri ve boyutları klinik evrelemeyi belirgin şekilde etkiler; nodül büyüklüğünün metastaz açısından değerlendirilmesi gerekir. Daha küçük nodlar metastazı dışlamaz; dağılım, morfoloji ve seri değişim birlikte değerlendirilir. Farklı ölçüm yöntemleri (örn. kısa eksen vs. uzun eksen) aynı hastada farklı klinik evre sınıflandırmalarına yol açabilir.

Normalde

Abdomen-pelvis BT'de retroperitoneumu, toraks BT'de mediasteni ve akciğerleri gözden geçirin.

Ayırıcı tanı

Nonseminomatöz germ hücreli tümör

büyük nodal kitlede kistik/nekrotik heterojenite ve tedavi sonrası teratom bileşenleri daha belirgin olabilir.

Lenfoma, büyük abdominal veya retroperitoneal kitlelerde seminom için ayırıcı tanıda yer alabilir; bildirilen bir seminom olgusunda da düşünülmüştür.

Reaktif lenf nodları ile malign lenf nodlarının görüntüleme özellikleri örtüşebilir; bu nedenle boyut ve morfoloji tek başına kesin ayrım sağlamayabilir.

Başka bir primer tümörün retroperitoneal metastazı, görüntülemede primer retroperitoneal kitlelerle örtüşebilir; kesin tanıda histopatoloji temel role sahiptir.

Tuzaklar

• Santral nekroz seminom nodlarında da görülebilir; nekrozu otomatik olarak nonseminom lehine sınıflamayın.
• Kısa ekseni küçük bir retroperitoneal lenf nodu metastazı tek başına dışlamaz; kullanılan ölçüm ekseni evre sınıflandırmasını etkileyebilir.
• Primer testis odağı BT ile dışlanamaz; skrotal ultrason bulgusunu ve histolojiyi kesitsel evreleme bulgularından ayrı tutun.

Kendini dene

1. Seminom tanılı hastada, tümör tarafının beklenen drenaj zincirinde belirgin büyümüş paraaortik nodül değerlendirilir. Hangi yorum en uygundur?

   • Seminom metastazı olabilir
   • Seminom dışlanır
   • Kesin lenfoma
   • Normal varyant
   Cevabı göster

   Seminom metastazı olabilir. Seminom metastatik nodları sıklıkla homojen görünür; BT morfolojisi histolojik doğrulama yerine geçmez. Nekrozun yokluğu seminomdan uzaklaştırmaz, lenfoma da yalnız bu görünümle kesinleştirilemez ve belirgin nodal kitle normal varyant değildir.

2. Testis seminomunda nodal kitleye ek olarak hangi uzak bölge rutin toraks evrelemesinde taranır?

   • Akciğer parankimi
   • Safra kesesi
   • Tiroid bezi
   • Pankreas kanalı
   Cevabı göster

   Akciğer parankimi. Testis germ hücreli tümörlerinde toraks BT akciğer metastazlarını ve supradiyafragmatik lenf nodlarını değerlendirir. Diğer seçenekler bu yayılım örüntüsünde rutin uzak metastaz alanı olarak öne çıkmaz.

İlgili konular

• Testis germ hücreli tümörü: BT evrelemesi

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 18 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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