A cyst defines a pocket fixed onto or in a body
tissue or organ, of varying size and structure, it is not connected with the outside. It can contain a gas, a liquid or semi-liquid substance, or rarely a solid. Most cysts are benign
, and they can grow in almost all organs, including the liver
, mammary gland, ovary
, or bone. Some cysts may be malignant
and associated with cancer
. A biopsy
is sometimes performed and studying it helps to understand the nature of the cyst. If the cyst is pathogenic, it can be removed by surgery.