Stage IIIB colorectal cancer; shows a cross-section of the colon/rectum and a two-panel inset. Each panel shows the layers of the colon/rectum wall: mucosa, submucosa, muscle layers, and serosa. Also shown are a blood vessel and lymph nodes. First panel shows cancer in all layers, spreading through the serosa, and in 3 lymph nodes. Second panel shows cancer in all layers and in 5 lymph nodes. Third panel shows cancer in the mucosa, submucosa, muscle layers, and 7 lymph nodes.
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