Cyst ni mfuko uliofungwa. Cyst inaweza kuwa na hewa, umajimaji, au nyenzo nusu-imara. Mkusanyiko wa pus huitwa abscess, ambayo sio cyst. Uvimbe unaweza kuhitaji kuondolewa kwa upasuaji, lakini hiyo itategemea aina na eneo lake.
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.
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Ganglion cyst ― Uvimbe usio na dalili ambao hutokea ghafla kati ya viungo. Ikiwa utambuzi wa cyst ya ganglioni imethibitishwa, tatizo linaweza kutatuliwa kwa kushinikiza nodule kwa bidii ili kupasuka cyst ndani.
Mucocele ― Inaonekana kama nundu laini kwenye midomo bila dalili zozote.