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]] | ||
Revision as of 00:44, 18 December 2013
Pilar cyst, also known as a trichilemmal cyst, is a common benign skin cyst.
General
- Very common.
- Benign.
Gross
- Classic location: head ~90%.[1]
Microscopic
Features:[2]
- 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.
- Has no granular layer - key feature.
DDx:
- Epidermal cyst - has a granular layer.
Images
Trichilemmal cyst - intermed. mag. (WC)
Trichilemmal cyst - very high mag. (WC)
www:
Sign out
SCALP (CYST), EXCISION: - TRICHILEMMAL CYST (PILAR CYST).
SKIN CYST, LEFT FLANK, EXCISION: - TRICHILEMMAL CYST (PILAR CYST).
SCALP (CYST), ANTERIOR, EXCISION: - TRICHILEMMAL CYST (PILAR CYST), RUPTURED.
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
References
- ↑ URL: http://emedicine.medscape.com/article/1058907-overview. Accessed on: 15 April 2012.
- ↑ Busam, Klaus J. (2009). Dermatopathology: A Volume in the Foundations in Diagnostic Pathology Series (1st ed.). Saunders. pp. 309. ISBN 978-0443066542.