Which histologic findings are characteristic of the reticulated or adenoid type of seborrheic keratosis?

Updated: Oct 14, 2020
  • Author: Arthur K Balin, MD, PhD, FACP; Chief Editor: William D James, MD  more...
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Answer

The reticulated or adenoid type (shown in the images below) of seborrheic keratoses contains numerous thin tracts of basaloid epidermal cells that are branched and interwoven. They have less epidermal thickening, and horn pseudocysts usually are less prominent in reticulated seborrheic keratoses. Marked hyperpigmentation is often present, and they have some histologic similarity to lentigo senilis.

Reticulated (or adenoid) type of seborrheic kerato Reticulated (or adenoid) type of seborrheic keratosis.
This is a reticulated (or adenoid) seborrheic kera This is a reticulated (or adenoid) seborrheic keratosis with abundant pigment.

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