Stage IV Colorectal Neuroendocrine Tumor AJCC v8

**Semantic type:** Neoplastic Process

**Definition:** Stage IV includes: (T1, Any N, M1); (T2, Any N, M1); (T3, Any N, M1); (T4, Any N, M1). T1: Tumor invading the lamina propria or submucosa and measuring 2 cm or less. T2: Tumor invading the muscularis propria or measuring more than 2 cm with invasion of the lamina propria or submucosa. T3: Tumor invading through the muscularis propria into subserosal tissue without penetration of overlying serosa. T4: Tumor invading the visceral peritoneum (serosa) or other organs or adjacent structures. M1: Distant metastasis. (AJCC 8th ed.)

**Synonyms:** - Stage IV Colorectal Neuroendocrine Tumor