Stage IB squamous cell carcinoma of the esophagus; drawing shows the esophagus and stomach. A two-panel inset shows the layers of the esophagus wall: the mucosa layer, thin muscle layer, submucosa layer, thick muscle layer, and connective tissue layer. The lymph nodes are also shown. The left panel shows cancer cells that are any grade or of an unknown grade in the mucosa layer, thin muscle layer, and submucosa layer. The right panel shows grade 1 cancer cells in the mucosa layer, thin muscle layer, submucosa layer, and thick muscle layer.
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