MONDO_0100571 (CTNNB1-related neurodevelopmental disorder and/or vitreoretinopathy) is any neurodevelopmental disorder and/or exudative vitreoretinopathy caused by a monoallelic variant in the CTNNB1 gene. Variants in CTNNB1 are related to a neurodevelopmental condition with a broad spectrum of presentations ranging from isolated vitreoretinopathy to a complex neurodevelopmental disorder with mild to severe intellectual disability, microcephaly, spasticity, autism spectrum disorder, and visual defects, including retinal detachment, and abnormal retinal vascularization.