Difference between revisions of "Seborrheic keratosis"

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Seborrheic keratosis (view source)

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| Caption    = Seborrheic keratosis. [[H&E stain]].  
| Caption    = Seborrheic keratosis. [[H&E stain]].  
| Micro      = horn cysts, pigmented basal layer, hyperkeratosis
| Micro      = horn cysts, pigmented basal layer, hyperkeratosis
| Subtypes  = Acanthotic seborrheic keratosis, reticulated seborrheic keratosis, irritated seborrheic keratosis, digitated seborrheic keratosis, stucco keratosis
| Subtypes  = acanthotic seborrheic keratosis, reticulated seborrheic keratosis, irritated seborrheic keratosis, digitated seborrheic keratosis, stucco keratosis
| LMDDx      = [[actinic keratosis]], [[verruca vulgaris]], [[basal cell carcinoma]] (fibroepitheliomatous pattern) - for reticulated SK, [[melanocytic nevus]], [[condyloma acuminatum]],  
| LMDDx      = [[actinic keratosis]], [[verruca vulgaris]], [[basal cell carcinoma]] (fibroepitheliomatous pattern) - for reticulated SK, [[melanocytic nevus]], [[condyloma acuminatum]], [[inverted follicular keratosis]], [[fibroepithelial polyp]]
[[inverted follicular keratosis]]
| Stains    =
| Stains    =
| IHC        =
| IHC        =
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| Assdx      = internal malignancy - if very many
| Assdx      = internal malignancy - if very many
| Syndromes  =
| Syndromes  =
| Clinicalhx = old age
| Signs      =
| Signs      =
| Symptoms  =
| Symptoms  =
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| Rads      =
| Rads      =
| Endoscopy  =
| Endoscopy  =
| Prognosis  = good
| Prognosis  = benign
| Other      =
| Other      =
| ClinDDx    =
| ClinDDx    = melanocytic lesion
}}
}}
'''Seborrheic keratosis''', abbreviated '''SK''', is a very common diagnosis is dermatopathology.
'''Seborrheic keratosis''', abbreviated '''SK''', is a very common diagnosis is [[dermatopathology]].


==General==
==General==
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==Gross==
==Gross==
[[Image:Seborrheic keratosis on human back.jpg|thumb|right|Clinical image showing a large number of SKs (Leser–Trélat sign). (WC/Heilman)]]
*"Stuck-on" appearance - raised lesion.
*"Stuck-on" appearance - raised lesion.
Image(s):
*[http://www.dermatlas.org/derm/IndexDisplay.cfm?ImageID=91774460 SK - gross image (dermatlas.org)].


==Microscopic==
==Microscopic==
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*Hyperkeratosis - stratum corneum extra thick.
*Hyperkeratosis - stratum corneum extra thick.
**May be minimal.
**May be minimal.
**Usually predominantly [[basketweave pattern]].
*Horn cysts - intraepidermal collections of keratin - '''key feature'''.
*Horn cysts - intraepidermal collections of keratin - '''key feature'''.
**Actually invaginations - '''not''' true cysts; thus, they may more accurately be called ''pseudohorn cysts''.<ref>URL: [http://www.healthcare.uiowa.edu/dermatology/dpt/HornCyst.htm http://www.healthcare.uiowa.edu/dermatology/dpt/HornCyst.htm]. Accessed on: 13 September 2012.</ref>
**Actually invaginations - '''not''' true cysts; thus, they may more accurately be called ''pseudohorn cysts''.<ref>URL: [http://www.healthcare.uiowa.edu/dermatology/dpt/HornCyst.htm http://www.healthcare.uiowa.edu/dermatology/dpt/HornCyst.htm]. Accessed on: 13 September 2012.</ref>
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DDx:<ref name=Ref_Derm338-9>{{Ref Derm|338-9}}</ref>
DDx:<ref name=Ref_Derm338-9>{{Ref Derm|338-9}}</ref>
*[[Actinic keratosis]] - especially, irritated SKs; have nuclear atypia and parakeratosis.
*[[Actinic keratosis]] - especially, irritated SKs; have nuclear atypia and parakeratosis.
*[[Verruca vulgaris]] - SK may have papillomatous projections.
*[[Verruca vulgaris]] - koilocytes, compact hyperkeratosis and parakeratosis.
**SKs typically have prominent basketweave hyperkeratosis.
**SKs may have papillomatous projections.  
*[[Basal cell carcinoma]], fibroepitheliomatous pattern - esp. reticulated SK.
*[[Basal cell carcinoma]], fibroepitheliomatous pattern - esp. reticulated SK.
*[[Melanocytic nevus]].
*[[Melanocytic nevus]].
*[[Condyloma acuminatum]] - may have horn cysts, more probable than SK in the genital area.
*[[Condyloma acuminatum]] - may have horn cysts, more probable than SK in the genital area.<ref name=pmid7978069>{{Cite journal  | last1 = Li | first1 = J. | last2 = Ackerman | first2 = AB. | title = "Seborrheic keratoses" that contain human papillomavirus are condylomata acuminata. | journal = Am J Dermatopathol | volume = 16 | issue = 4 | pages = 398-405; discussion 406-8 | month = Aug | year = 1994 | doi =  | PMID = 7978069 }}</ref>
*[[Inverted follicular keratosis]] - predominantly endophytic growth pattern, may be considered a variant of seborrheic keratosis.<ref name=Ref_Derm341>{{Ref Derm|341}}</ref>
*[[Inverted follicular keratosis]] - predominantly endophytic growth pattern, may be considered a variant of seborrheic keratosis.<ref name=Ref_Derm341>{{Ref Derm|341}}</ref>
*Collision with another lesion.
**In one series, 85 of 639 SK were associated with other lesions.<ref name=pmid16637806>{{Cite journal  | last1 = Lim | first1 = C. | title = Seborrhoeic keratoses with associated lesions: a retrospective analysis of 85 lesions. | journal = Australas J Dermatol | volume = 47 | issue = 2 | pages = 109-13 | month = May | year = 2006 | doi = 10.1111/j.1440-0960.2006.00258.x | PMID = 16637806 }}</ref>
**It is postulated that melanocytic lesions are associated with SKs.<ref name=pmid23785597>{{Cite journal  | last1 = Defazio | first1 = J. | last2 = Zalaudek | first2 = I. | last3 = Busam | first3 = KJ. | last4 = Cota | first4 = C. | last5 = Marghoob | first5 = A. | title = Association between melanocytic neoplasms and seborrheic keratosis: more than a coincidental collision? | journal = Dermatol Pract Concept | volume = 2 | issue = 2 | pages = 202a09 | month = Apr | year = 2012 | doi = 10.5826/dpc.0202a09 | PMID = 23785597 }}</ref>
*[[Papillomatous compound nevus]] - a beign nevus with seborrheic keratosis-like features.
*[[Acanthosis nigricans]] - site important.
*[[Fibroepithelial polyp]], epithelial type - may have abundant compact keratin, lack horn cysts.
*[[Eccrine poroma]] - lack horn cysts.


===Images===
===Images===
<gallery>
<gallery>
Image:SkinTumors-P5280040.JPG | Seborrheic keratosis. (WC)
Image:Seborrheic_keratosis_(1).jpg | Seborrheic keratosis - low mag. (WC)
Image:Seborrheic_keratosis_(1).jpg | Seborrheic keratosis - low mag. (WC)
Image:Seborrheic_keratosis_%282%29.jpg | Seborrheic keratosis - high mag. (WC)
Image:Seborrheic_keratosis_%282%29.jpg | Seborrheic keratosis - high mag. (WC)
</gallery>
</gallery>
www:
<gallery>
Image: Seborrheic keratosis - low mag.jpg | SK - low mag. (WC)
Image: Seborrheic keratosis - intermed mag.jpg | SK - intermed. mag. (WC)
Image: Seborrheic keratosis - high mag.jpg | SK - high mag. (WC)
</gallery>
====www====
*[http://www.dermatlas.org/derm/IndexDisplay.cfm?ImageID=-1985374774 Seborrheic keratosis - high mag. (dermatlas.org)].
*[http://www.dermatlas.org/derm/IndexDisplay.cfm?ImageID=-1985374774 Seborrheic keratosis - high mag. (dermatlas.org)].
*[http://www.dermatlas.org/derm/IndexDisplay.cfm?ImageID=-1880960893 Seborrheic keratosis - low mag.  (dermatlas.org)].
*[http://www.dermatlas.org/derm/IndexDisplay.cfm?ImageID=-1880960893 Seborrheic keratosis - low mag.  (dermatlas.org)].
*[http://ispub.com/IJD/7/2/7627 Gallery of SK variants (ispub.com)].<ref>{{Cite journal  | last1 = Sarma | first1 = DP. | last2 = Repertinger | first2 = S. | title = Seborrheic Keratosis: A Pictorial Review of the Histopathologic Variations. | journal = The Internet Journal of Dermatology| volume = 7 | issue = 2 | pages =  | month = | year = | doi =  | PMID = |URL = http://ispub.com/IJD/7/2/7627 }}</ref>
*[http://ispub.com/IJD/6/2/3323 Acantholytic SK (ispub.com)].<ref>{{Cite journal | last1 = Wang | first1 = J | last2 = Wang | first2 = B | last3 = Shehan | first3 = J | last4 = Sarma | first4 = D | title =  Acantholytic Seborrheic Keratosis | journal = The Internet Journal of Dermatology. | volume = 6 | issue = 2 | pages = | month = | year = 2007 | doi = | PMID = | PMC = | url = http://print.ispub.com/api/0/ispub-article/3323 }}</ref>


===Histologic subtypes===
===Histologic subtypes===
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==Sign out==
==Sign out==
<pre>
Skin Lesion, Left Lower Leg, Excision:
- Seborrheic keratosis, completely excised.
- Solar elastosis.
</pre>
<pre>
Skin Lesion (Submitted "Seborrheic Keratosis"), Right Back, Excision:
    - Extensively fragmented bland superficial squamous epithelium with
      horn cysts and keratineous material, compatible with impression of
      seborrheic keratosis; deeper lesion cannot be excluded.
</pre>
===Block letters===
<pre>
<pre>
SKIN LESION, MID BACK, BIOPSY:
SKIN LESION, MID BACK, BIOPSY:
- SEBORRHEIC KERATOSIS.
- SEBORRHEIC KERATOSIS.
</pre>
<pre>
SKIN LESION, RIGHT SCAPULA, PUNCH BIOPSY:
- RETICULATED SEBORRHEIC KERATOSIS.
</pre>
<pre>
SKIN LESION ("NEVUS"), RIGHT TRUNK AT BRA LINE, SHAVE BIOPSY:
- IRRITATED SEBORRHEIC KERATOSIS (HYPERKERATOTIC TYPE).
</pre>
<pre>
SKIN LESION, LEFT POSTERIOR SHOULDER, EXCISION:
- SEBORRHEIC KERATOSIS (ACANTHOTIC TYPE), COMPLETELY EXCISED.
</pre>
<pre>
SKIN LESION, LEFT POSTERIOR SHOULDER, EXCISION:
- SEBORRHEIC KERATOSIS WITH PIGMENTATION (ACANTHOTIC TYPE), COMPLETELY EXCISED
  IN THE PLANE OF SECTION.
- NEGATIVE FOR MELANOCYTIC LESION.
</pre>
</pre>


===Micro===
===Micro===
The sections show skin with acanthosis, pseudohorn cysts, parakeratosis, hyperkeratosis and focal basal epidermal pigmentation.  There is no basal nuclear atypia, and there are no
The sections show skin with acanthosis, pseudohorn cysts, hyperkeratosis and focal basal epidermal pigmentation.  There is no basal nuclear atypia, and there are no
melanocytic nests or mitoses.  There is minimal dermal inflammation. There is no
melanocytic nests. Mitotic activity is not apparent.  There is minimal dermal inflammation. There is no apparent solar elastosis.
apparent solar elastosis.


====Without horn pseudocysts====
====Without horn pseudocysts====
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====Minimal hyperkeratosis====
====Minimal hyperkeratosis====
The sections show skin with acanthosis, pseudohorn cysts, rare parakeratosis, minimal hyperkeratosis and focal basal epidermal pigmentation. There is no basal nuclear atypia, no appreciable mitotic activity and there are no melanocytic nests. There is minimal dermal inflammation. Solar elastosis is present.
The sections show skin with acanthosis, pseudohorn cysts, rare parakeratosis, minimal hyperkeratosis and focal basal epidermal pigmentation. There is no basal nuclear atypia, no appreciable mitotic activity and there are no melanocytic nests. There is minimal dermal inflammation. Solar elastosis is present.
====Reticulated seborrheic keratosis====
The sections show hair-bearing skin with fine strands of benign basaloid epidermal cells
extending from the epidermis.  The superficial dermis has dense collagen. No
significant inflammation is present. Pseudohorn cysts are present focally.
There is no hyperkeratosis or acanthosis.  No pigmentation is apparent. No large blood
vessels are identified. No nuclear atypia is seen.
====Irritated SK====
The sections show skin with acanthosis, pseudohorn cysts, hyperkeratosis and basal epidermal pigmentation. There are no melanocytic nests. Mitotic activity is not readily apparent. A dermal lymphohistiocytic infiltrate is present. Reactive basal cell changes are present. There is no apparent solar elastosis. The lesion is incompletely
excised.
====Wart-like SK====
The sections show skin with papillomatous acanthosis and, predominantly, basketweave hyperkeratosis.  A lesser amount of compact hyperkeratosis and parakeratosis is present.
Koilocytes are not identified. Blood vessels close to the dermal-epidermal junction are not prominent. Pseudohorn cysts are not apparent.
There are no melanocytic nests. There is no apparent solar elastosis. There is a moderate lymphohistiocytic dermal infiltrate. There is minimal basal atypia. Mitotic activity is not readily apparent.
====Stucco keratosis====
The sections show skin with pointed papillomatous projections and hyperkeratosis.
There is no basal nuclear atypia, and there are no melanocytic nests. Mitotic activity is
not apparent. There is minimal dermal inflammation. Solar elastosis is present.
The lesion is excised in the plane of section.
Note:
*Signed out as ''seborrheic keratosis, early''.


==See also==
==See also==
Michael
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