Epidermoid cyst
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{{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}}