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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 ?
In the twenty-second edition of the dictionary (RAE, 2001) there are two definitions for microcephalic, which summarize the definitions given in previous editions.
Taybi-Linder syndrome or microcephalic osteodysplastic primordial dwarfism types 1 and 3 (MOPD); exhibit a phenotypic pattern characterized by intrauterine and postnatal growth retardation, microcephaly, dysmorphic facies, skeletal dysplasia, low birth weight, and brain abnormalities.
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.
Now 25" tall and 14lbs in weight, Finn was born with an incredibly rare condition called microcephalic osteodysplastic primordial dwarfism type 2 (MOPD II).
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.
Take, for example, his fascinating account of the 1853 exhibition of two microcephalic "Aztec" children, Maximo and Bartola.
And it is surely not realistic that, with the developmental skills of a 6- to 12-month-old, this microcephalic child has forced her father to reexamine and change the legacy that has weighed so heavily upon him.
The size of each mastoid also depends upon the final size of the skull in an individual; as for instance an acromegalic skull has a thick, large expansive mastoid, and a microcephalic, a small underdeveloped mastoid (Graham & Brackmen).