A 52-year-old man from Delhi presents with a 3-month history of progressive dysphagia and weight loss. Upper endoscopy reveals a 4 cm ulcerated lesion in the mid-esophagus. Biopsy confirms squamous cell carcinoma. Which investigation is most appropriate for accurate TNM staging of this esophageal cancer?

Explanation

## Staging Esophageal Cancer: Role of EUS **Key Point:** Endoscopic ultrasound (EUS) is the gold standard for local T and N staging of esophageal cancer. ### Why EUS is Superior: | Investigation | T-staging | N-staging | M-staging | Best Use | |---|---|---|---|---| | **EUS** | Excellent (layers) | Excellent (local nodes) | No | T & N | | **CT** | Moderate | Moderate | Excellent | M & distant nodes | | **PET-CT** | Poor | Moderate | Excellent | M & metabolic | | **CXR/Barium** | Poor | No | No | Screening only | ### EUS Advantages: - Visualizes all 5 esophageal wall layers → accurate T staging - Detects lymph nodes as small as 5 mm - Allows FNA for nodal cytology (N staging) - Highest sensitivity for T1–T3 lesions **Clinical Pearl:** EUS should be performed before CT to avoid post-biopsy edema artifact. Combined EUS + CT provides complete TNM staging. **High-Yield:** For esophageal cancer, the staging algorithm is: EUS (T, N) + CT/MRI (M, distant nodes) + PET-CT (if considering curative therapy).