proximal 16p11.2 microdeletion syndrome (MONDO_0012756, a Monarch Disease Ontology id) is a chromosomal anomaly characterized by developmental and language delays, mild intellectual disability, social impairments (autism spectrum disorders), mild variable dysmorphism and predisposition to obesity. Also known as: autism susceptibility 14A, chromosome 16p11.2 deletion syndrome, 593kb, proximal del(16)(p11.2), proximal monosomy 16p11.2.