Cysta (Cyst) je uzavretý vak. Cysta (cyst) môže obsahovať vzduch, tekutinu alebo polotuhý materiál. Zbierka hnisu sa nazýva absces, čo nie je cysta. Cystu môže byť potrebné chirurgicky odstrániť, ale to bude závisieť od jej typu a umiestnenia.
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 ― Asymptomatické hrčky, ktoré sa náhle objavia medzi kĺbmi. Ak sa potvrdí diagnóza gangliovej cysty, problém môže byť vyriešený silným stlačením uzla, aby sa cysta roztrhla vo vnútri.
Mucocele ― Vyzerá ako jemný hrbolček na perách bez akýchkoľvek príznakov.
