Fibrous and Fibroosseous tumors of bone
McCune-Albright syndrome

Author: Nat Pernick, M.D. (see Authors page)

Revised: 7 October 2016, last major update August 2013

Copyright: (c) 2003-2016,, Inc.

PubMed Search: Fibrous dysplasia mccune-albright syndrome

Related topics: Fibrous dysplasia, Monostotic, Polyostotic, Mazabraud syndrome, Fibrous dysplasia protuberans

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Cite this page: McCune-Albright syndrome. website. Accessed January 19th, 2019.
Definition / general
  • 1 - 3% of cases
  • Common presentation is precocious puberty in girls
  • Due to somatic mutation of c-fos oncogene (alpha subunit of signal-transducing G proteins - Gsalpha) that causes activation of cAMP pathway
  • Polyostotic fibrous dysplasia, cafe-au-lait skin pigmentation (large, dark lesions with serpiginous [“coast of Maine”] borders in chest, neck, back), almost exclusively in women
  • Also endocrine abnormalities (precocious puberty in girls, hyperthyroidism, pituitary adenomas that secrete growth hormone, primary adrenal hyperplasia)
  • Malignant transformation in 4%
Gross images

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4 year old girl with mosaic pattern
of darkened skin and body cast
due to fractures