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Dermatological signs lead to discovery of mosaic ACTB variants in segmental odontomaxillary dysplasia

Segmental odontomaxillary dysplasia (SOD) is a rare condition of unknown incidence, with approximately 60 cases reported (as reviewed in 2018)1 . It presents at birth or during childhood with a constellation of ipsilateral facial signs: non-progressive/slowly-progressive overgrowth or undergrowth of soft tissues and/or bones (typically centred on the posterior maxilla, and leading to facial asymmetry), dental anomalies (missing teeth or abnormal dentition), gingival hyperplasia or abnormal gingivae, commissural lip fissures, hypertrichosis, cutaneous hyperpigmentation and/or erythema, cutaneous depression, and lip hypopigmentation.