Pilar cyst - Revision history

Michael: /* Sign out */

2015-10-06T13:32:01Z

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← Older revision		Revision as of 13:32, 6 October 2015
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	<pre>		<pre>
	Scalp (Cyst), Excision:		Scalp (Cyst), Excision:
	- ~~Trichilemmal~~ cyst (pilar cyst).		- Benign trichilemmal cyst (pilar cyst).
	</pre>		</pre>

Michael: /* Sign out */

2015-10-06T13:29:36Z

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← Older revision		Revision as of 13:29, 6 October 2015
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	==Sign out==		==Sign out==
			<pre>
			Scalp (Cyst), Excision:
			- Trichilemmal cyst (pilar cyst).
			</pre>

			===Block letters===
	<pre>		<pre>
	SCALP (CYST), EXCISION:		SCALP (CYST), EXCISION:

Michael: /* Microscopic */

2013-12-18T01:48:56Z

Microscopic

← Older revision		Revision as of 01:48, 18 December 2013
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	DDx:		DDx:
	*[[Epidermal cyst]] - has a granular layer.		*[[Epidermal cyst]] - has a granular layer.
	*[[Squamous cell ~~carinoma~~ of the skin\|Squamous cell carcinoma]] arising from a pilar cyst.		*[[Squamous cell carcinoma of the skin\|Squamous cell carcinoma]] arising from a pilar cyst.

	===Images===		===Images===

Michael: /* Microscopic */

2013-12-18T01:48:35Z

Microscopic

← Older revision		Revision as of 01:48, 18 December 2013
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	DDx:		DDx:
	*[[Epidermal cyst]] - has a granular layer.		*[[Epidermal cyst]] - has a granular layer.
			*[[Squamous cell carinoma of the skin\|Squamous cell carcinoma]] arising from a pilar cyst.

	===Images===		===Images===
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	*[http://dermatlas.med.jhmi.edu/derm/indexDisplay.cfm?ImageID=69966366 Trichilemmal cyst (dermatlas.med.jhmi.edu)].		*[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)].		*[http://www.flickr.com/photos/40764007@N08/3881846034/in/photostream/ Trichilemmal cyst (flickr.com)].

	==Sign out==		==Sign out==
	<pre>		<pre>

Michael at 01:47, 18 December 2013

2013-12-18T01:47:57Z

← Older revision		Revision as of 01:47, 18 December 2013
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	==General==		==General==
	*Very common.		*Very common.
	*Benign.		*Benign.‡
	*The clinical history for these typically says ''[[sebaceous cyst]]''.		*The clinical history for these typically says ''[[sebaceous cyst]]''.

			Note:
			*‡A super rare malignant counter part is described; approximately 40 cases are reported in the english literature.<ref name=pmid22470211>{{Cite journal \| last1 = Goyal \| first1 = S. \| last2 = Jain \| first2 = BB. \| last3 = Jana \| first3 = S. \| last4 = Bhattacharya \| first4 = SK. \| title = Malignant proliferating trichilemmal tumor. \| journal = Indian J Dermatol \| volume = 57 \| issue = 1 \| pages = 50-2 \| month = Jan \| year = 2012 \| doi = 10.4103/0019-5154.92679 \| PMID = 22470211 }}</ref>

	==Gross==		==Gross==

Michael at 01:38, 18 December 2013

2013-12-18T01:38:13Z

← Older revision		Revision as of 01:38, 18 December 2013
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	{{ Infobox diagnosis		{{ Infobox diagnosis
	\| Name = {{PAGENAME}}		\| Name = {{PAGENAME}}
	\| Image = Trichilemmal_cyst_-~~_intermed_mag~~.jpg		\| Image = Trichilemmal_cyst_-_very_high_mag.jpg
	\| Width =		\| Width =
	\| Caption = Pilar cyst. [[H&E stain]].		\| Caption = Pilar cyst. [[H&E stain]].
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	<gallery>		<gallery>
	Image:Trichilemmal_cyst_-_intermed_mag.jpg \| Trichilemmal cyst - intermed. mag. (WC)		Image:Trichilemmal_cyst_-_intermed_mag.jpg \| Trichilemmal cyst - intermed. mag. (WC)
			Image:Trichilemmal_cyst_-_high_mag.jpg \| Trichilemmal cyst - high mag. (WC)
	Image:Trichilemmal_cyst_-_very_high_mag.jpg \| Trichilemmal cyst - very high mag. (WC)		Image:Trichilemmal_cyst_-_very_high_mag.jpg \| Trichilemmal cyst - very high mag. (WC)
	</gallery>		</gallery>

Michael at 01:37, 18 December 2013

2013-12-18T01:37:26Z

← Older revision		Revision as of 01:37, 18 December 2013
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	*Very common.		*Very common.
	*Benign.		*Benign.
			*The clinical history for these typically says ''[[sebaceous cyst]]''.

	==Gross==		==Gross==

Michael: +infobox

2013-12-18T00:46:37Z

+infobox

← Older revision		Revision as of 00:46, 18 December 2013
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			{{ Infobox diagnosis
			\| Name = {{PAGENAME}}
			\| Image = Trichilemmal_cyst_-_intermed_mag.jpg
			\| Width =
			\| Caption = Pilar cyst. [[H&E stain]].
			\| Micro = cyst lining by a stratified squamous epithelium without a granular layer - contains keratin; no significant nuclear atypia; +/-[[granuloma\|granulomatous inflammation]] (due to rupture)
			\| Subtypes =
			\| LMDDx = [[epidermal inclusion cyst]]
			\| Stains =
			\| IHC =
			\| EM =
			\| Molecular =
			\| IF =
			\| Gross = nodule +/-yellow colour
			\| Grossing =
			\| Site = [[skin]] - usu. scalp
			\| Assdx =
			\| Syndromes =
			\| Clinicalhx =
			\| Signs =
			\| Symptoms =
			\| Prevalence = very common
			\| Bloodwork =
			\| Rads =
			\| Endoscopy =
			\| Prognosis = benign
			\| Other =
			\| ClinDDx = other [[skin cysts]]
			}}
	'''Pilar cyst''', also known as a '''trichilemmal cyst''', is a common benign [[dermal cysts\|skin cyst]].		'''Pilar cyst''', also known as a '''trichilemmal cyst''', is a common benign [[dermal cysts\|skin cyst]].

Michael: /* References */

2013-12-18T00:44:48Z

References

← Older revision		Revision as of 00:44, 18 December 2013
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	==References==		==References==
	{{Reflist\|2}}		{{Reflist\|1}}

	[[Category:Diagnosis]]		[[Category:Diagnosis]]
			[[Category:Dermal cysts]]

Michael: split-out

2013-12-18T00:44:21Z

split-out

← Older revision		Revision as of 00:44, 18 December 2013
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	~~#redirect~~ [[~~Dermal_cysts#Pilar_cyst~~]]		'''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]]