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, the cyst could go away by itself or will have to be removed using surgery.
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
), 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
is collection without a distinct membrane.
A syrinx in the spinal cord or brainstem is sometimes inaccurately referred to as a cyst.