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The condition of having an abnormally small head, with a circumference less than two standard deviations below the mean.



substantial reduction in skull and brain size in the presence of normal dimensions of other parts of the body. Microcephaly is accompanied by mental deficiency, from mild imbecility to idiocy. The causes of microcephaly are viral diseases suffered by the mother during the first three months of pregnancy, toxoplasmosis, and, sometimes, intrauterine meningoencephalitis of the fetus. The prognosis is unfavorable.

References in periodicals archive ?
The ministry's conclusion was made after tests on the tissue of a deceased child with microcephalic symptoms by the Ivandro Chagas Institute in Belem, Brazil, one of South America's leading health institutes.
A cerebral organoid from a microcephalic patient's cells (top, lower row) was also smaller than one grown from healthy ceils (upper row).
erectus but do fall within the range for microcephalic humans, so Holloway concludes that the fossil could have suffered from microcephaly and is not necessarily a separate species.
Wednesday Extraordinary People: Britain's Tiniest Toddlers, five, 9pm This programme charts the lives of three children who have microcephalic osteodysplastic primordial dwarfism, an incredibly rare condition that means they are half the size of other children their age.
For instance, Cowan exhorted the audience to "contemplate the possibility of political discourse not pushed through [the] microcephalic filter of some ill-educated but firm-jawed stage prop of a newsreader.
State University, said: "We have answered the people who contend the Hobbit is microcephalic.
12) Given this cultural context, William Henry Johnson's prominence is not surprising, for his microcephalic appearance merely exaggerated the prevailing doctrine.
Peters acknowledges, however, that two events in his personal life could also bias his work: each of his daughters "owes her life to reproductive technology," and "one was erroneously diagnosed mid-pregnancy as being microcephalic.
Physical examination revealed a microcephalic infant with bilateral neck swelling.