| microcephaly | An abnormally small head of a newborn, a congenitally small brain. (27 Sep 1997) |
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| schisencephalic microcephaly | Dysgenic process resulting in focal cerebral defects. (05 Mar 2000) |
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| encephaloclastic microcephaly | Complex growth disturbances in the brain as a result of regressive changes in foetal life. (05 Mar 2000) |