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Difference between revisions of "Pilar cyst"
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'''Pilar cyst''', also known as a '''trichilemmal cyst''', is a common benign [[dermal cysts|skin cyst]]. | |||
==General== | |||
*Very common. | |||
*Benign. | |||
==Gross== | |||
*Classic location: head ~90%.<ref>URL: [http://emedicine.medscape.com/article/1058907-overview http://emedicine.medscape.com/article/1058907-overview]. Accessed on: 15 April 2012.</ref> | |||
==Microscopic== | |||
Features:<ref name=Ref_Derm309>{{Ref Derm|309}}</ref> | |||
*Keratin. | |||
*Cyst lining: | |||
**Has no granular layer - '''key feature'''. | |||
***Keratohyaline granules (as seen in the granular layer) may be seen focally. | |||
**Inner most cyst lining cells are large cells with abundant eosinophilic cytoplasm. | |||
DDx: | |||
*[[Epidermal cyst]] - has a granular layer. | |||
===Images=== | |||
<gallery> | |||
Image:Trichilemmal_cyst_-_intermed_mag.jpg | Trichilemmal cyst - intermed. mag. (WC) | |||
Image:Trichilemmal_cyst_-_very_high_mag.jpg | Trichilemmal cyst - very high mag. (WC) | |||
</gallery> | |||
www: | |||
*[http://dermatlas.med.jhmi.edu/derm/indexDisplay.cfm?ImageID=69966366 Trichilemmal cyst (dermatlas.med.jhmi.edu)]. | |||
*[http://www.flickr.com/photos/40764007@N08/3881846034/in/photostream/ Trichilemmal cyst (flickr.com)]. | |||
==Sign out== | |||
<pre> | |||
SCALP (CYST), EXCISION: | |||
- TRICHILEMMAL CYST (PILAR CYST). | |||
</pre> | |||
<pre> | |||
SKIN CYST, LEFT FLANK, EXCISION: | |||
- TRICHILEMMAL CYST (PILAR CYST). | |||
</pre> | |||
<pre> | |||
SCALP (CYST), ANTERIOR, EXCISION: | |||
- TRICHILEMMAL CYST (PILAR CYST), RUPTURED. | |||
</pre> | |||
===Micro=== | |||
The sections show a cyst that is lined by squamous epithelium without a granular layer. Focally, keratohyaline granules are seen in the cyst lining cells. The innermost cyst lining cells are large and have abundant eosinophilic cytoplasm. The cyst contains keratin. | |||
==See also== | |||
*[[Dermal cysts]]. | |||
==References== | |||
{{Reflist|2}} | |||
[[Category:Diagnosis]] | [[Category:Diagnosis]] | ||