ON THIS PAGE: You will find some basic information about this disease and the parts of the body it may affect. This is the first page of Cancer.Net’s Guide to Gallbladder Cancer. To see other pages, use the menu on the side of your screen. Think of that menu as a roadmap to this full guide.
Gallbladder cancer occurs when normal cells in the gallbladder change and grow uncontrollably, forming a mass called a tumor. A tumor can be benign (noncancerous) or malignant (cancerous, meaning it can spread to other parts of the body). Primary gallbladder cancer is cancer that starts in the gallbladder, as opposed to cancer that begins somewhere else in the body and spreads to the gallbladder.
About the gallbladder
The gallbladder is a pear-shaped organ located just under the liver. The gallbladder stores bile, a fluid made by the liver that helps to digest fats. Bile is released from the gallbladder through a tube, called the common bile duct, as food is broken down in the stomach and intestines.
The gallbladder’s wall is made up of three main layers of tissue: the mucosa, which is the innermost layer and covers the wall of the gallbladder; the muscularis, the middle layer of smooth muscle; and the serosa, the outer layer. Primary gallbladder cancer begins in the inner layer and spreads into the outer layers as it grows.
Looking for More of an Overview?
If you would like additional introductory information, explore this related item. Please note this link takes you to another section on Cancer.Net:
- Cancer.Net En Español : Read about gallbladder cancer in Spanish. Infórmase sobre cáncer de vesícula biliar en español. 
To continue reading this guide, use the menu on the side of your screen to select another section.