ischio-vertebral syndrome (MONDO_0019413, a Monarch Disease Ontology identifier) is a very rare, poorly-defined bone disease characterized by ischial aplasia or hypoplasia, vertebral anomalies (vertebral malsegmentation, kyphoscoliosis), and in some patients, non-distinctive facial dysmorphism. Also known as: ischio-spinal dysostosis, ischio-vertebral dysplasia.