MONDO_0016842 (paternal 20q13.2q13.3 microdeletion syndrome) is a recently described syndrome characterized by severe pre- and post-natal growth retardation, microcephaly, intractable feeding difficulties, mild psychomotor retardation, hypotonia and facial dysmorphism. Also known as: paternal 20q13.2-q13.3 microdeletion syndrome, paternal del(20)(q13.2q13.3), paternal monosomy 20q13.2-q13.3, paternal monosomy 20q13.2q13.3.