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Difference between revisions of "Melanocytic lesions"
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→Acral nevus
(→Acral nevus: +not) |
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===Microscopic=== | ===Microscopic=== | ||
Features: | Features: | ||
*Acral skin: | |||
**Thick stratum corneum (hyperkeratotic). | |||
**Thick stratum spinosum (acanthotic). | |||
*Nevus with intraepidermal ascent of cells. | *Nevus with intraepidermal ascent of cells. | ||
| Line 475: | Line 478: | ||
*Intraepidermal ascent of cells is usually suggestive of melanoma. | *Intraepidermal ascent of cells is usually suggestive of melanoma. | ||
**In acral sites the criteria are relaxed, i.e. this is considered benign for this site. | **In acral sites the criteria are relaxed, i.e. this is considered benign for this site. | ||
*Nests in the ridges raise the suspicion of melanoma. | |||
**Memory device "ridges are risky, furrows are fine".<ref name=pmid22703907>{{Cite journal | last1 = Elston | first1 = D. | title = Practical advice regarding problematic pigmented lesions. | journal = J Am Acad Dermatol | volume = 67 | issue = 1 | pages = 148-55 | month = Jul | year = 2012 | doi = 10.1016/j.jaad.2012.04.006 | PMID = 22703907 }}</ref> | |||
DDx: | |||
*Acral lentiginous melanoma - have | |||
==Dysplastic melanocytic nevus== | ==Dysplastic melanocytic nevus== | ||