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 lower third of the esophagus. Biopsy confirms adenocarcinoma. CT chest and abdomen shows no distant metastases, but there is involvement of the gastroesophageal junction. What is the most appropriate next step in management?

Explanation

## Rationale for EUS in Esophageal Cancer Staging **Key Point:** Endoscopic ultrasound (EUS) is the gold standard for locoregional staging of esophageal cancer, particularly for T-stage (depth of invasion) and N-stage (lymph node involvement) assessment. ### Why EUS Is the Next Step 1. **T-stage determination**: EUS can accurately assess the depth of tumor invasion (T1–T4) with 85–90% accuracy, which is critical for treatment planning. 2. **N-stage assessment**: EUS-guided fine-needle aspiration (FNA) allows tissue diagnosis of regional lymph nodes, identifying metastatic involvement. 3. **Treatment stratification**: The combination of T and N staging from EUS helps determine candidacy for: - Neoadjuvant chemoradiation (T3–T4 or N+) - Curative surgical resection - Palliative approaches ### Staging Workflow for Esophageal Cancer ```mermaid flowchart TD A[Histologically confirmed esophageal cancer]:::outcome --> B[EUS for T and N staging]:::action B --> C{T and N status?}:::decision C -->|T1-2, N0| D[Consider endoscopic resection or surgery]:::action C -->|T3-4 or N+| E[Neoadjuvant chemoradiation + surgery]:::action C -->|M1 or unresectable| F[Palliative chemotherapy/stent]:::action E --> G[PET-CT for M-staging if high risk]:::action D --> H[Surgical resection]:::action ``` **High-Yield:** In this patient with locally advanced disease (4 cm lesion with GEJ involvement), EUS is essential before committing to neoadjuvant therapy or surgery. **Clinical Pearl:** PET-CT is used for M-staging (distant metastases) after locoregional staging is complete, not as the initial staging modality. [cite:Robbins 10e Ch 15]