A cyst is a closed sac having a distinct membrane and division on the nearby tissue. It may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, not a cyst. Once formed, a cyst could go away on its own or may have to be removed through surgery.
Cystic fibrosis
Despite being described in 1938 as involving the microscopic appearance of cysts in the pancreas cystic fibrosis is an example of a genetic disorder whose name is related to fibrosis of the cystic duct and does not involve actual cysts.Benign vs malignant
Many cysts in the body are benign(functional), the result of plugged ducts or other natural body outlets for secretions. However, a few are tumors or are produced within tumors, and are potentially malignant:
- Dermoid cyst
- Keratocyst
source : http://en.wikipedia.org/wiki/Cysts
