Disease or Syndrome
osteoma cutis
Definitions related to osteoma cutis:
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Disorders of GNAS inactivation include the phenotypes pseudohypoparathyroidism Ia, Ib, and Ic (PHP-Ia, -Ib, -Ic), pseudopseudohypoparathyroidism (PPHP), progressive osseous heteroplasia (POH), and osteoma cutis (OC). PHP-Ia and PHP-Ic are characterized by: End-organ resistance to endocrine hormones including parathyroid hormone (PTH), thyroid-stimulating hormone (TSH), gonadotropins (LH and FSH), growth hormone-releasing hormone (GHRH), and CNS neurotransmitters (leading to obesity and variable degrees of intellectual disability and developmental delay); and The Albright hereditary osteodystrophy (AHO) phenotype (short stature, round facies, and subcutaneous ossifications) and brachydactyly type E (shortening mainly of the 4th and/or 5th metacarpals and metatarsals and distal phalanx of the thumb). Although PHP-Ib is characterized principally by PTH resistance, some individuals also have partial TSH resistance and mild features of AHO (e.g., brachydactyly). PPHP, a more limited form of PHP-Ia, is characterized by various manifestations of the AHO phenotype without the hormone resistance or obesity. POH and OC are even more restricted variants of PPHP: POH consists of dermal ossification beginning in infancy, followed by increasing and extensive bone formation in deep muscle and fascia. OC consists of extra-skeletal ossification that is limited to the dermis and subcutaneous tissues.GeneReviewsUniversity of Washington, 2021
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Heterotopic ossification of the skin not associated with a preexisting lesion or process, such as inflammation or neoplasia.NCI ThesaurusU.S. National Cancer Institute, 2021
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The term osteoma refers to the anomalous presence of ossification (bone formation) in the interior of the dermis or epidermis. The dermal or subcutaneous bone formation presents as stony hard nodules. The osteomata appear as irregular, hardened small nodules that are well circumscribed and generally of the same color as the skin.Human Phenotype Ontology (HPO)The Human Phenotype Ontology Project, 2021
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Strictly defined, osteoma cutis refers to the presence of bone within the skin in the absence of a preexisting or associated lesion. This is opposed to secondary types of cutaneous ossification that can occur in reaction to inflammatory, traumatic, and neoplastic processes.WebMD, 2019
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Progressive osseous heteroplasia (POH) is a progressive bone disorder in which bone forms (ossifies) within skin and muscle tissue. It usually becomes apparent in infancy with skin (cutaneous) ossification, which progresses to involvement of subcutaneous and deep tissues, including muscle. In some cases, it first becomes apparent later...National Center for Advancing Translational Sciences
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