nevus sebaceus


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nevus sebaceus

[′nē·vəs si′bā·shəs]
(medicine)
A nevus formed by an aggregate of sebaceous glands. Also known as Jadassohn's nevus.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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They often arise on the scalp of children within a preexisting nevus sebaceus, but may occur in adults.
Occasionally mistaken for fetal scalp monitor trauma, neonatal herpes simplex infection, or a nevus sebaceus of Jadassohn, this characteristic pattern--a collar of coarse hair surrounding an area of membranous aplasia cutis congenita--can be a marker for cranial dysraphism, a developmental defect of the skull potentially associated with structural neurologic defects.