In appendix cancer, abnormal cells grow uncontrollably, forming a tumor in the small pouch connected to the colon. Appendix tumors can be benign (non-cancerous) or malignant (cancerous). Appendix cancer is often discovered when a person has surgery for another condition such as appendicitis, or during a CT scan. A rare condition, appendix cancer is estimated to affect two people per million, according to the Gateway for Cancer Research.
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