blue nevus

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blue nevus

[′blü ′nē·vəs]
(medicine)
A nevus composed of spindle-shaped pigmented melanocytes in the middle and lower two-thirds of the dermis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Nevus sebaceous (NS) is a congenital hamartoma of the sebaceous glands that was first described by Josef Jadassohn, MD, in 1895.
Nevus sebaceous, also known as nevus sebaceous of Jadassohn, was first described in 1895 by Josef Jadassohn as a nevoid growth composed predominantly of sebaceous glands.