Dark skin focalities: Difference between revisions

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===Melanocytic lesions===
===Melanocytic lesions===
Scrolling through the epidermis at intermediate magnification and then through the dermis at a lower magnification.
Melanocytic lesions (including nevus) are the most common, and can be classified as follows:
Melanocytic lesions (including nevus) are the most common, and can be classified as follows:
{|class="wikitable"
{|class="wikitable"
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|-
|-
! Junction<br>between<br>epidermis<br>and dermis
! Junction<br>between<br>epidermis<br>and dermis
| [[File:Histopathology of melanocytic nevus.jpg|link=Junctional nevus|200px|center]] [[Junctional nevus]] || [[File:Histopathology of lentigo maligna.jpg|200px|center|link=Melanoma in situ]] [[Melanoma in situ]]
| [[File:Histopathology of melanocytic nevus.jpg|link=Junctional nevus|200px|center]] '''[[Junctional nevus]]''' || [[File:Histopathology of lentigo maligna.jpg|200px|center|link=Melanoma in situ]] '''[[Melanoma in situ]]'''
|-
|-
! Dermis
! Dermis
| [[File:Histopathology of dermal nevus, high magnification.jpg|160px|center|link=Dermal nevus]] [[Dermal nevus]] || [[File:Histopathology of nodular melanoma, high magnification.jpg|200px|center|link=Invasive melanoma of the skin]] [[Invasive melanoma of the skin|Invasive melanoma]]
| [[File:Histopathology of dermal nevus, high magnification.jpg|160px|center|link=Dermal nevus]] '''[[Dermal nevus]]''' || [[File:Histopathology of nodular melanoma, high magnification.jpg|200px|center|link=Invasive melanoma of the skin]] '''[[Invasive melanoma of the skin|Invasive melanoma]]'''
|}
|}
 
A '''compound nevus''' consists of both junctional and dermal melanocytic nevus nests.
Evaluation is largely based on the relative incidence and malignancy of various differential diagnoses (see pie chart). Main approaches are:
*Direct pattern recognition
*Systematic
 
Either way can be done by scrolling through the epidermis at intermediate magnification and then through the dermis at a lower magnification.


===Non-melanocytic===
===Non-melanocytic===
<gallery>
<gallery mode=packed heights=180>
File:Histopathology of a pigmented basal-cell carcinoma.jpg|Pigmented '''[[basal-cell carcinoma]]''', with palisading cells around nests.
File:Histopathology of seborrheic keratosis.jpg|link=Seborrheic keratosis|[[Seborrheic keratosis]]
File:Histopathology of seborrheic keratosis.jpg|link=Seborrheic keratosis|[[Seborrheic keratosis]]
File:Basal Cell Carcinoma, Nodular Pattern (6032028849).jpg|link=Basal cell carcinoma|[[Basal cell carcinoma]]
</gallery>
</gallery>
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