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Difference between revisions of "Melanocytic lesions"
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Melanocytic lesions (view source)
Revision as of 21:35, 13 September 2012
, 21:35, 13 September 2012→Recurrent melanocytic nevus
(→Recurrent nevus: tweak name) |
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==Recurrent melanocytic nevus== | ==Recurrent melanocytic nevus== | ||
*[[AKA]] ''persistent melanocytic nevus''. | |||
*[[AKA]] ''pseudomelanoma''. | |||
===General=== | ===General=== | ||
* | *Classically, arises at the site of a partially excised nevus.<ref name=Ref_Derm465>{{Ref Derm|465}}</ref> | ||
===Microscopic=== | ===Microscopic=== | ||
| Line 171: | Line 173: | ||
#*Thick collagen bundles arranged parallel to the skin surface. | #*Thick collagen bundles arranged parallel to the skin surface. | ||
#Features of an [[intradermal nevus]]. | #Features of an [[intradermal nevus]]. | ||
May have:<ref name=Ref_Derm465>{{Ref Derm|465}}</ref> | |||
*Pagetoid spread of melanocytes. | |||
*Confluent nests at the DE junction. | |||
*Nuclear atypia - uncommon. | |||
DDx:<ref name=Ref_Derm465>{{Ref Derm|465}}</ref> | |||
*[[Melanoma in situ]] - classically spread beyond the scar, unlike pseudomelanoma - growth confined to epidermis. | |||
===IHC=== | |||
*HMB-45 deep component -ve. | |||
*Ki-67 - non-proliferative. | |||
==Pigmented spindle cell nevus== | ==Pigmented spindle cell nevus== | ||