Skin - Nonmelanocytic tumors
Other tumors of skin
Hamartoma of scalp with ectopic meningothelial elements
Reviewer: Christopher Hale, M.D. (see Reviewers page)
Revised: 14 September 2012, last major update September 2012
Copyright: (c) 2001-2012, PathologyOutlines.com, Inc.
● Scalp nodule that often arises during infancy containing meningothelial cells; may be diagnosed later in life
● Also called rudimentary meningocele or meningothelial hamartoma of scalp
● Related to meningioma of skin
● 9 year old girl with scalp lesion (Pediatr Dermatol 2011;28:677)
● 78 year old man with scalp lesion (Eur J Dermatol 2011;21:255)
● Whorls or dissecting pattern of meningothelial cells in dermis and subcutis
● Often psammoma bodies and cartilage
● Center of lesion may have long cleft
● Adipose tissue, blood vessels, nerves admixed with lesion
H&E and immunostains
● Vimentin, EMA
● CD34, CD31, factor VIII related antigen, AE1/AE3, S100 and alpha-smooth muscle actin
● Metastatic carcinoma, spindle cell/pleomorphic lipoma
End of Skin - Nonmelanocytic tumors > Other tumors of skin > Hamartoma of scalp with ectopic meningothelial elements
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