Appendix Adenoma

**Semantic type:** Neoplastic Process

**Definition:** A circumscribed neoplasm arising from the glandular epithelium of the appendix. Morphologically, it is characterized by a proliferation of neoplastic glandular cells and it is associated with dysplasia. According to the growth pattern, it may be classified as tubular, villous, or tubulovillous. The dysplasia is classified as mild, moderate, or severe.