MedGen

Simpson-Golabi-Behmel syndrome is an X-linked condition characterized by pre- and postnatal overgrowth, coarse facies, congenital heart defects, and other congenital abnormalities (Xuan et al., 1999). It shows phenotypic similarities to Beckwith-Wiedemann syndrome (BWS; 130650), another overgrowth syndrome. Genetic Heterogeneity of Simpson-Golabi-Behmel Syndrome See Simpson-Golabi-Behmel syndrome type 2 (SGBS2; 300209), caused by mutation in the OFD1 gene (300170) on chromosome Xp22. [from OMIM]

Simpson-Golabi-Behmel syndrome type 1 (SGBS1) is characterized by pre- and postnatal macrosomia; distinctive craniofacial features (including macrocephaly, coarse facial features, macrostomia, macroglossia, and palatal abnormalities); and commonly, mild-to-severe intellectual disability with or without structural brain anomalies. Other variable findings include supernumerary nipples, diastasis recti / umbilical hernia, congenital heart defects, diaphragmatic hernia, genitourinary defects, and gastrointestinal anomalies. Skeletal anomalies can include vertebral fusion, scoliosis, rib anomalies, and congenital hip dislocation. Hand anomalies can include large hands and postaxial polydactyly. Affected individuals are at increased risk for embryonal tumors including Wilms tumor, hepatoblastoma, adrenal neuroblastoma, gonadoblastoma, hepatocellular carcinoma, and medulloblastoma. [from GeneReviews]