The cancer side picks up where eradication ends: the patient whose EMR specimen shows invasion past the mucosa, or who presents with cancer outside a known Barrett field. The histology split, the TNM T categories, and the T1a-versus-T1b line organize everything that follows, because depth of invasion is what selects the treatment lane. The case. An EMR done for a Barrett nodule returns adenocarcinoma invading the submucosa (T1b). The patient assumed endoscopic cure. Why does the depth change the plan, and what is the next step? Topics coveredTwo histologies: adenocarcinoma (rising, distal, Barrett-linked) and squamous cell (proximal, different risks)Squamous risk factors: smoking, alcohol, achalasia, caustic injury, tylosis (RHBDF2)TNM staging: Tis is high-grade dysplasia, T1a mucosa, T1b submucosaThe T1a-versus-T1b boundary as the endoscopic-eligibility lineEUS for T and N staging; PET-CT for distant diseaseNode risk climbs sharply once tumor reaches the submucosaCROSS neoadjuvant chemoradiation for locally advanced diseaseEsophagectomy and the role of definitive chemoradiation in squamous cellPalliative stenting and the management of malignant dysphagia Key decisionsT1a mucosal cancer is endoscopically curable; T1b submucosal invasion carries enough nodal risk to move most patients to esophagectomy or multimodal therapyAn EMR that upstages to T1b changes the plan from endoscopic cure to surgical or neoadjuvant treatment: depth, not the initial biopsy, decidesLocally advanced disease (T3 or node-positive) gets CROSS neoadjuvant chemoradiation before surgery, not surgery aloneSquamous cell carcinoma is more radiosensitive: definitive chemoradiation is a curative-intent option, unlike for most adenocarcinomaStaging sequence is EUS then PET-CT: local depth and nodes first, distant disease before committing to a curative plan For the full chapter with MCQs, tables, and primary-guideline references, visit www.boardpearls.com.Questions or feedback: [email protected]. (00:00) - Opening: two histologies, different lives (02:00) - Squamous risk factors and tylosis (04:00) - TNM staging and the T categories (07:00) - The T1a versus T1b boundary (09:30) - EUS and PET-CT workup (12:00) - CROSS neoadjuvant chemoradiation and esophagectomy

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“What did the council decide on item 42?” — answered with the speaker and the moment.

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