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| Clinically,
these lesions are characterized by elevated, irregular lesions which often
have a crusted or greasy appearance (#21841).
In addition, these lesions may be somewhat pigmented.
Histologically, seborrheic keratosis is characterized by marked
benign proliferation of epithelial cells causing a large degree of
acanthosis. In addition, the
epithelium shows a tremendous hyperkeratosis or proliferation of keratin
with multiple keratin-filled cysts (#21843). The epithelium may also show signs of increased pigmentation,
especially in the basilar cell layer.
There are no dysplastic changes noted in the epithelium.
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| Clinical
#21841 |
High
Power #21843 |
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