Endocrinologie et syndrome métabolique
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Rare Genetic Cases of Heterotopic Ossification

Ashwini Mallappa, Anu Vishwanath, Marsha C Pratt, Klaas J Wierenga and Sowmya Krishnan

Heterotopic Ossification (HO) is formation of normal bone in extraskeletal tissues, namely the skin, subcutaneous tissue and deep connective tissue. Heterotopic ossification can be hereditary or nonhereditary in nature. We report two cases of rare hereditary forms of heterotopic ossification namely Fibrodysplasia Ossificans Progressiva (FOP) and Progressive Osseous Heteroplasia (POH). Hereditary forms of heterotopic ossification are progressive and severely debilitating in nature. Though these disorders are rare, awareness and knowledge about these disorders will help in early identification of such unique cases, leading to appropriate referral and management.