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An abnormality of the sternum that presents at birth as a ventral sternal non-union defect, due to an abnormality of the fusion of the layers of the skin. It presents as a scar-like line that extends upward from the umbilicus (belly button). [https://www.chw.org/medical-care/birthmarks-and-vascular-anomalies-center/conditions/phace-syndrome/phace-syndrome-handbook/ventral-or-midline-abnormalities, PMID:24075092]
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