Autosomal recessive primary microcephaly (MCPH) is a rare genetically heterogeneous disorder of neurogenic brain development characterized by reduced head circumference at birth with no gross anomalies of brain architecture and variable degrees of intellectual impairment. The disease is Monarch Disease Ontology id MONDO_0016660 (autosomal recessive primary microcephaly). Also known as: MCPH, microcephalia vera, microcephaly vera, microcephaly, primary autosomal recessive, microcephaly, primary, autosomal recessive.