Abstract
ABSTRACTRubinstein–Taybi syndrome (RSTS) is a rare syndrome characterized by intellectual disability, distinctive facial features and distal limb abnormalities. RSTS is indicated by clinical features and confirmed via genetic testing. In this prenatal case series, we report four cases of RSTS with various sonographic features. Some features, such as corpus callosum dysgenesis, are nonspecific, but they may be the first sign apparent, as they appear early in pregnancy. Others, like beaked nose, shawl scrotum, premature coccygeal ossification, and overly mature scrotal sac with excessive rugae, are distinctive, but they may only be apparent in advanced gestation.
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