Appendix cancer: A malignancy of the appendix, accounting for about 1 in 200 of all gastrointestinal malignancies. Although unusual, cancer of the appendix can range in type. The most common type of appendiceal cancer is carcinoid tumor with adenocarcinoma next. Tumors of the appendix often present with a pattern of spread referred to as peritoneal seeding of the malignant cells. Advances in treatment have raised survival rates to about 80%.
- Appendix epididymis
Appendix epididymis: A small cystic projection from the surface of the epididymis (a structure within the scrotum that is attached to the backside of the testis), which represents a remnant of the embryologic mesonephros.
- Appendix epiploica
Appendix epiploica: A finger-like projection of fat attached to the colon.
- Appendix testis
Appendix testis: A small solid projection of tissue on the outer surface of the testis, which is a remnant of the embryologic mullerian duct.
Apposition: The word “apposition” has several senses including the act of adding or accretion and also the putting of things in juxtaposition, or side by side. Growth by apposition is a mode of growth that is characteristic of many tissues in the body by which nutritive matter from the blood is transformed on the surface […]
- Approved drug
Approved drug: A medication approved for marketing. In the US, the Food and Drug Administration (FDA) must approve a substance as a drug before it can be marketed. The approval process involves several steps including pre-clinical laboratory and animal studies, clinical trials for safety and efficacy, filing of a New Drug Application by the manufacturer […]