Our Microcephaly Main Article provides a comprehensive look at the who, what, when and how of Microcephaly
Definition of Microcephaly
Microcephaly: An abnormally small head due to failure of brain growth. Microcephaly is an ominous sign because it is almost always associated with developmental delay and mental retardation. Many factors can impair the growth of the brain, including intrauterine infections (such as rubella, cytomegalovirus, and toxoplasmosis), intrauterine chemical exposure (such as in fetal alcohol syndrome), excessive radiation exposure (as in an atomic bomb explosion), chromosome abnormalities (such as trisomy 13 and trisomy 18), and genetic syndromes (such as Fanconi syndrome and Williams syndrome). The opposite of microcephaly is macrocephaly.
Last Editorial Review: 3/19/2012
Back to MedTerms online medical dictionary A-Z List
Need help identifying pills and medications?