Monarch Disease Ontology identifier MONDO_0013336 (chromosome 19p13.13 deletion syndrome) can be described as follows. 19p13.13 microdeletion syndrome is a rare partial autosomal monosomy characterized by global developmental delay, moderate intellectual disability, macrocephaly, overgrowth, hypotonia, and facial dysmorphism (frontal bossing, down-slanting palpebral fissures). Other associated features variably include ataxia, seizures, ventriculomegaly, ocular abnormalities (strabismus, optic nerve hypoplasia) and gastrointestinal problems (abdominal pain, vomiting, constipation). Also known as: Del(19)(p13.13), monosomy 19p13.13.