Congenital radioulnar synostosis: is prenatal diagnosis possible?- A case report

Objectives: The main objectives of this case report are to discuss prenatal ultrasound findings of congenital radioulnar synostosis and to review the literature.Case report: A patient was diagnosed with congenital radioulnar synostosis at eight months old when parents noticed limited motions in the child's left forearm. The parent denied any traumatic or family history of bony malformations. Physical examination by a pediatric orthopedics specialist and digital radiography revealed proximal radioulnar synostosis. The case report includes perinatal course, com- parison between the postnatal radiography and fetal ultrasound images.Conclusion: Congenital radioulnar synostosis is often associated with sex chromosome abnormalities and congenital musculoskeletal disorders or syndromes affecting limbs. Isolated congenital radioulnar syn- ostosis is hardly diagnosed before birth, in some cases even have been neglected postnatally. Knowing the developmental milestones of the forearm and specified high-risk groups might help develop a tar- geted screening strategy to increase the possibility of early detection and intervention.(c) 2023 Taiwan Association of Obstetrics & Gynecology. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).