Congenital Features?

[KeratinPearls]

In dermpath, what does congenital features mean and what is the significance of it (that dermpaths put it into the diagnosis line).

Thanks.

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[deleted314957]

See Lever, 10th ed. page 727. I can't just hand you the answer. you can probably just google it.

 

[zao275]

-Dermal nevus cells infiltrating between strands of collagen and "splaying" them apart.
-Nevus cells following/tracking down adnexal structures (follicular and eccrine).

-Most specific feature for being a truly congenital nevus (from what I have been taught): nevus cells "invading" within an arrector pili muscle. I have only seen this once or twice, so I don't think it is very common but supposedly the classic finiding.

-Some architectural distortion in the junctional component that can possibly have a superficial resemblance to dysplastic nevus (not a real congenital feature but you can see this in congenital nevi)

 

[caffeinegirl]

Nevi, both conventional and dysplastic may have congenital patterns/features. As stated earlier, these are usually seen when melanocytes follow adnexal structures, vessels, and even nerves.
Although mostly reported as a histological finding, when a nevus is following adnexal structures and is transected at the base, it usually portends that the nevus may recur.

 

[pathstudent]

congenital moles have features that are somtimes seen in melanoma like crawling along adenexal structures but congenital moles are totally benign.

 

[dermpathdoc]

congenital moles have features that are somtimes seen in melanoma like crawling along adenexal structures but congenital moles are totally benign.

moles = fuzzy blind animals that burrow underground( I tried to post a pic..but it would not post!)
or the chemical measurement of a molar unit

a congenital melanocytic nevus shows changes such as melanocytes involving hair follilcles/pilar muscle bundles or nerves within the dermis splaying ebtween collagen bundles...