Progressive osseous heteroplasia

Progressive osseous heteroplasia is a cutaneous condition characterized by cutaneous or subcutaneous ossification.[1]

Progressive osseous heteroplasia
SpecialtyDermatology

According to the Progressive Osseous Heteroplasia Association:

Progressive Osseous Heteroplasia (POH) is a rare genetic condition in which the body makes extra bone in locations where bone should not form. Extra bone develops inside skin, subcutaneous tissue (fat tissue beneath the skin), muscles, tendons, and ligaments. This ”out of place extra bone formation” is commonly referred to as heterotopic ossification. In people with POH, nodules and lace-like webs of extra bone extend from the skin into the subcutaneous fat and deep connective tissues, and may cross joints. Extra bone formation near the joints may lead to stiffness, locking, and permanent immobility.”[2]

It is associated with GNAS.[3]

A telltale symptom of POH is osteoma cutis under the skin of a newborn.[4] It was discovered in 1994 by physician Frederick Kaplan.[5]

Diagnosis

Patients with POH have a distinctly different manifestation of symptoms than those with fibrodysplasia ossificans progressiva (FOP), though heterotopic ossification appears in both diseases. They lack the congenital abnormality of the big toe that is a diagnostic feature for FOP. People with POH also have ossification of the skin during infancy, which does not occur in FOP. Also, the pattern of ossification differs in POH, spreading in an intramembranous fashion rather than endochondral.[6]

See also

References
  1. Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 978-1-4160-2999-1.
  2. "About POH Disease". Retrieved 2012-06-15.
  3. Adegbite NS, Xu M, Kaplan FS, Shore EM, Pignolo RJ (July 2008). "Diagnostic and mutational spectrum of progressive osseous heteroplasia (POH) and other forms of GNAS-based heterotopic ossification". Am. J. Med. Genet. A. 146A (14): 1788–96. doi:10.1002/ajmg.a.32346. PMC 2564798. PMID 18553568.
  4. Karen Kreeger (October 9, 2017). "Piecing Together the Puzzle of a Rare-Among-Rare Bone Disorder". University of Pennsylvania Health System.
  5. Kaplan, F. S.; Craver, R.; MacEwen, G. D.; Gannon, F. H.; Finkel, G.; Hahn, G.; Tabas, J.; Gardner, R. J.; Zasloff, M. A. (1994). "Progressive osseous heteroplasia: a distinct developmental disorder of heterotopic ossification. Two new case reports and follow-up of three previously reported cases". Journal of Bone and Joint Surgery. 76 (3): 425–436. doi:10.2106/00004623-199403000-00013. PMID 8126048.
  6. Kaplan, Frederick S.; Shore, Eileen M. (2000). "Progressive Osseous Heteroplasia". Journal of Bone and Mineral Research. 15 (11): 2084–2094. doi:10.1359/jbmr.2000.15.11.2084. PMID 11092391. S2CID 21642426.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.