Branchial Cleft Cyst in Simpson-Golabi-Behmel Syndrome: A Case Report Expanding the Phenotypic Spectrum of GPC3-Related Disorders
Background: Simpson-Golabi-Behmel syndrome (SGBS) is a rare X-linked overgrowth disorder caused by pathogenic variants or copy number changes in the GPC3 gene located at Xq26.2. GPC3 encodes a heparan sulfate proteoglycan involved in the regulation of Wnt, FGF, BMP, and SHH signaling pathways during embryogenesis. Dysf...