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McCune-Albright syndrome

Fibrous dysplasia/McCune-Albright syndrome (FD/MAS), the result of an early embryonic postzygotic somatic activating mutation of GNAS (encoding the cAMP pathway-associated G-protein, Gsa), is characterized by involvement of the skin, skeleton, and certain endocrine organs. However, because Gsa signaling is ubiquitous additional tissues may be affected. Café-au-lait skin macules are common and are usually the first manifestation of the disease, apparent at or shortly after birth. Fibrous dysplasia (FD), which can involve any part and combination of the craniofacial, axial, and/or appendicular skeleton, can range from an isolated, asymptomatic monostotic lesion discovered incidentally to a severe disabling polyostotic disease involving practically the entire skeleton and leading to progressive scoliosis, facial deformity, and loss of mobility, vision, and/or hearing. Endocrinopathies include: Gonadotropin-independent precocious puberty resulting from recurrent ovarian cysts in girls and autonomous testosterone production in boys; Testicular lesions with or without associated gonadotropin-independent precocious puberty; Thyroid lesions with or without non-autoimmune hyperthyroidism; Growth hormone excess; FGF23-mediated phosphate wasting with or without hypophosphatemia in association with fibrous dysplasia; and Neonatal hypercortisolism. The prognosis for individuals with FD/MAS is based on disease location and severity. [from NCBI]

MedGen UID:
Concept ID:
Disease or Syndrome

Polyostotic fibrous dysplasia of bone

Fibrous dysplasia of the bones were lesions are localized in many bones throughout of the body. Polyostotic fibrous dysplasia is a cardinal feature of McCune-Albright syndrome. [from HPO]

MedGen UID:
Concept ID:
Congenital Abnormality; Disease or Syndrome

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