Epidermoid cyst 1258641 219711200 2008-06-16T15:05:13Z Fratrep 4541225 Repairing link to disambiguation page - [[Wikipedia:Disambiguation pages with links|You can help!]] {{Infobox_Disease | Name = {{PAGENAME}} | Image = Epidermal Cyst ear.JPG | Caption = Epidermal Cyst, ear | DiseasesDB = 29388 | ICD10 = {{ICD10|L|72|0|l|60}} | ICD9 = {{ICD9|706.2}} | ICDO = | OMIM = 131600 | MedlinePlus = | eMedicineSubj = derm | eMedicineTopic = 860 | MeshID = D004814 }} An '''epidermoid cyst''' is a [[benign]] [[cyst]], developed out of [[ectoderm|ectodermal]] tissue. [[Histology|Histologically]], it is made of a thin layer of [[squamous]] [[epithelium]]. It is very common for women on the major or minor [[labia (genitalia)|labia]]. ==Terminology== The more general term for an Epidermal Inclusion Cyst (which strictly means implantation of [[Epidermis (skin)|epidermal]] elements into the [[dermis]]), Epidermoid cyst includes cysts originating from the [[infundibular]] portion of the [[hair follicle]]. The majority of Epidermal Inclusion Cysts do in fact originate from the infundibular portion of the hair follicle thus explaining the interchangeable,<ref>{{cite web |url=http://www.meddean.luc.edu/lumen/MEdEd/Medicine/dermatology/melton/cyst10.htm |title=Epidermoid cyst |accessdate=2007-11-14 |format= |work=}}</ref> yet technically incorrect, use of these two terms. ==Causes== These cysts are caused by a [[bacterium]] and form into a [[pimple]]-like shape. They are also seen in [[Gardner's syndrome]] on the head and neck. ==Presentation== For some individuals, it doesn't even irritate. For others, it can hurt and when touched, it can release [[pus]]. In contrast to [[pilar cyst]]s, epidermoid cysts usually present on parts of the body with relatively little hair.<ref>{{cite web |url=http://www.bad.org.uk/patients/leaflets/cysts.asp |title=cysts - British Association of Dermatologists |accessdate=2007-11-14 |format= |work=}}</ref> Although they are not [[malignant]], it is possible for malignant tumors to arise from them.<ref name="pmid17847698">{{cite journal |author=Jehle KS, Shakir AJ, Sayegh ME |title=Squamous cell carcinoma arising in an epidermoid cyst |journal=British journal of hospital medicine (London, England : 2005) |volume=68 |issue=8 |pages=446 |year=2007 |pmid=17847698 |doi=}}</ref> ==Diagnosis== [[Magnetic resonance imaging|MRT]] [[isointens]], [[FLAIR]] [[hyperintens]]. ==Treatment== Cysts can be removed by [[excision]].<ref>{{cite web |url=http://www.aafp.org/afp/20020401/1423ph.html |title=Minimal Excision Technique for Removal of an Epidermoid Cyst - April 1, 2002 - American Academy of Family Physicians |accessdate=2007-11-14 |format= |work=}}</ref> ==See also== *[[Sebaceous cyst]] (since [[ICD-10 Chapter XII: Diseases of the skin and subcutaneous tissue|L72.0]] is often mixed up with L72.1) ==References== {{reflist}} ==External links== * {{DermNet|lesions/cysts}} {{Diseases of the skin and subcutaneous tissue}} [[Category:Dermatology]] [[de:Epidermoidzyste]] [[ja:粉瘤腫]] [[nl:epidermoïd cyste]] {{dermatology-stub}}