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Osteogenesis imperfecta type III (OI type III) is a form of osteogenesis imperfecta, a group of genetic conditions that primarily affect the bones. In OI type III, specifically, a diagnosis can often be made shortly after birth as fractures (broken bones) during the newborn period simply from handling the infant are common. Other signs and symptoms vary significantly from person to person but may include severe bone fragility, bone malformations, short stature, dental problems (dentinogenesis imperfect), macrocephaly (unusually large head), hearing loss, and blue sclerae (whites of the eyes). Most affected people are unable to walk without assistance. OI type III is caused by changes (mutations) in the COL1A1 or COL1A2 genes and is inherited in an autosomal dominant manner. Treatment is based on the signs and symptoms present in each person.
Source: GARD Last updated on 05-01-20
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