Cista (Cyst) je zatvorena vreća. cista (cyst) može sadržavati zrak, tekućine ili polučvrsti materijal. Nakupljanje gnoja naziva se apsces (abscess), koji nije cista. Cista će možda morati biti uklonjena kirurški, ali to ovisi o njenom tipu i lokaciji.
A cyst is a closed sac, having a distinct envelope and division compared with the nearby tissue. Hence, it is a cluster of cells that has grouped together to form a sac (like the manner in which water molecules group together to form a bubble); however, the distinguishing aspect of a cyst is that the cells forming the "shell" of such a sac are distinctly abnormal (in both appearance and behaviour) when compared with all surrounding cells for that given location. A cyst may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, not a cyst. Once formed, a cyst may resolve on its own. When a cyst fails to resolve, it may need to be removed surgically, but that would depend upon its type and location.
Ganglion cyst ― Asimptomatske kvržice koje se iznenada pojavljuju između zglobova. Ako se dijagnoza ganglionske ciste potvrdi, problem se može riješiti snažnim pritiskom na nodul kako bi cista pukla unutra.
Mucocele ― Izgleda kao meka kvrga na usnama bez ikakvih simptoma.
