Appendix Mucinous Neoplasm

**Semantic type:** Neoplastic Process

**Definition:** A neoplasm that arises from the appendix and is characterized by mucinous epithelial proliferation and extracellular mucin production. It is classified as low-grade or high-grade and is often discovered incidentally or may present with abdominal pain, a mass, or spread to the peritoneum (pseudomyxoma peritonei).

**Synonyms:** - AMN - Appendix Mucinous Tumor