Cyst 188222 225292588 2008-07-12T22:44:56Z Arcadian 104523 infobox {{otheruses4|cysts in the body|the [[ICAO airport code]] '''CYST'''|St. Theresa Point Airport|hard-shelled resting stages of some small organisms|Microbial cyst}} {{Infobox_Disease | Name = {{PAGENAME}} | Image = | Caption = | DiseasesDB = | ICD10 = | ICD9 = | ICDO = | OMIM = | MedlinePlus = | eMedicineSubj = | eMedicineTopic = | MeshID = D003560 | }} A '''cyst''' is a closed sac having a distinct [[biological membrane|membrane]] and [[division]] on the nearby [[Biological tissue|tissue]]. They 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. == Locations == * [[Arachnoid cyst]] (between the surface of the brain and the cranial base or on the arachnoid membrane) * [[Baker's Cyst]] (behind the knee joint) * [[Bartholin's cyst]] * [[Breast cyst]] * [[Chalazion|Chalazion cyst]] (eyelid) * [[Cysticercosis|Cysticercal cyst]] (the larval stage of ''Taenia sp.'') * [[Dentigerous Cyst]] (associated with the crowns of non-erupted teeth) * [[Dermoid cyst]] (ovaries, testes, many other locations from head to tailbone) * [[Epididymal Cyst]] (found in the vessels attached to the testes) * [[Ganglion cyst]] (hand/foot joints and tendons) * Glial Cyst (in the brain) * [[Gartner's duct]] cyst (vaginal or vulvar cyst of embryological origin) * [[Hydatid cyst]] (larval stage of ''Echinococcus granulosus'' ([[tapeworm]])) * [[Odontogenic keratocyst|Keratocyst]] (in the jaws, these can appear solitary or associated with the Gorlin-Goltz or [[Nevoid basal cell carcinoma syndrome]]. The latest [[World Health Organization]] classification considers Keratocysts as tumors rather than cysts) * [[Polycystic liver disease|Liver cystic disease]] * [[Chalazion|Meibomian cyst]] (eyelid) * [[Nabothian cyst]] (cervix) * [[Ovarian cyst]] (ovaries, functional and pathological) * [[Paratubal cyst]] (fallopian tube) * [[Pilonidal cyst]] (skin infection near tailbone) * [[Polycystic kidney disease|Renal cyst]] (kidneys) * [[Polycystic ovary syndrome]] * [[Radicular cyst]] (associated with the roots of non-vital teeth) * [[Sebaceous cyst]] (sac below skin) * [[Tarlov cyst]] (spine) * [[Vocal fold cyst]] ===Cystic fibrosis=== Despite being described in 1938 as involving the [[microscopic]] appearance of cysts in the pancreas<ref name=Anderson1938>{{cite journal | author = Anderson, D.H. | year = 1938 | title = Cystic fibrosis of the pancreas and its relation to celiac disease | journal = Am J Dis Child | volume = 56 | pages = 344–399}}</ref> [[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.<ref>{{cite journal |author=Greenholz SK, Krishnadasan B, Marr C, Cannon R |title=Biliary obstruction in infants with cystic fibrosis requiring Kasai portoenterostomy |journal=J. Pediatr. Surg. |volume=32 |issue=2 |pages=175–9; discussion 179–80 |year=1997 |pmid=9044117|doi=10.1016/S0022-3468(97)90174-3}}</ref> == Benign vs malignant == Many cysts in the body are [[benign]] ([[functional]]), 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 [[cancer|malignant]]: * [[Dermoid cyst]] * [[Odontogenic keratocyst|Keratocyst]] ==Related structures== A [[pseudocyst]] is collection without a distinct membrane. A [[syrinx (medicine)|syrinx]] in the spinal cord or brainstem is sometimes inaccurately referred to as a cyst. ==References== {{reflist}} ==External links== * {{FPnotebook|DER78}} * [http://www.medicinenet.com/script/main/art.asp?articlekey=55517 "Cyst Symptoms and Causes"] by Melissa Conrad Stöppler, MD and William C. Shiel, Jr., MD, FACP, FACR. {{pathology-stub}} {{Tumors}} [[Category:Gross pathology]] [[cs:Cysta (lékařství)]] [[de:Zyste]] [[es:Quiste]] [[fr:Kyste]] [[io:Kisto]] [[it:Cisti (medicina)]] [[he:ציסטה]] [[hu:Ciszta]] [[nl:Cyste]] [[ja:嚢胞]] [[no:Cyste]] [[pl:Torbiel]] [[ru:Киста]] [[fi:Kysta]] [[sv:Cysta]] [[te:తిత్తి]] [[th:ซีสต์]] [[tr:Kist]]