Prominent glabella B microcephaly B hypogenitalism is a very rare syndrome described in two sibs and characterized by prenatal onset of growth deficiency, microcephaly, hypoplastic genitalia, and birth onset of convulsions. The disease is Monarch Disease Ontology entry MONDO_0009543 (prominent glabella-microcephaly-hypogenitalism syndrome). Also known as: MacDermot-Winter syndrome.