Kardia ve Özofagus Kanserinde Klinik Evrelemede Radyolojinin Yeri
Özet
Özofagus ve kardia kanserlerinde doğru klinik evreleme, prognozun belirlenmesi ve isabetli tedavi protokollerinin seçilmesi açısından kritik öneme sahiptir. Lokal yayılım ve uzak metastazların değerlendirilmesinde endoskopik ultrason (EUS), bilgisayarlı tomografi (BT) ve pozitron emisyon tomografisi (PET-BT) yaygın olarak kullanılan yöntemlerdir. EUS, özellikle tümörün duvar invazyon derinliğini ve lokal lenf nodu (N evresi) tutulumunu yüksek doğrulukla saptar; EUS kılavuzluğunda yapılan ince iğne aspirasyon biyopsisi (EUS-FNA) ise tanısal hassasiyeti belirgin ölçüde artırır. Ancak EUS, tümörün neden olduğu tam darlıklarda ve neoadjuvan kemoradyoterapi sonrası gelişen doku değişikliklerinde sınırlı kalmaktadır. İlk evreleme yöntemi olarak sıkça başvurulan BT, erken evre tümör ayrımında yetersiz kalabilse de rezeke edilemeyen ileri evre (T4) hastalık ile uzak metastazların belirlenmesinde etkilidir. PET ve entegre PET/BT ise özellikle gözden kaçabilecek uzak metastazların saptanmasında en duyarlı yöntemler olup tedavi stratejisini doğrudan değiştirebilir. Son yıllarda teknik gelişmeler ve difüzyon özelliklerinin eklenmesiyle hareket artefaktları azaltılan manyetik rezonans görüntüleme (MR), lokal T-evrelemesinde noninvaziv ve umut vadeden bir alternatif olarak öne çıkmaktadır.
Accurate clinical staging in esophagus and cardia cancers is critical for determining prognosis and selecting appropriate treatment protocols. Endoscopic ultrasound (EUS), computed tomography (CT), and positron emission tomography (PET-CT) are widely used methods for evaluating local invasion and distant metastases. EUS specifically detects the depth of tumor wall invasion and local lymph node (N stage) involvement with high accuracy, while EUS-guided fine-needle aspiration (EUS-FNA) significantly increases diagnostic sensitivity. However, EUS remains limited in cases of total strictures caused by the tumor and tissue changes developing after neoadjuvant chemoradiotherapy. Frequently utilized as the initial staging method, CT may be insufficient in differentiating early-stage tumors but is effective in identifying unresectable advanced-stage (T4) disease and distant metastases. PET and integrated PET/CT are the most sensitive methods, particularly for detecting otherwise unnoticed distant metastases, and can directly alter the treatment strategy. In recent years, with technical advancements and the addition of diffusion properties that reduce motion artifacts, magnetic resonance imaging (MRI) has emerged as a noninvasive and promising alternative for local T-staging.
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