Abstract
The head circumferences of 73 learning-disabled children were compared with those of a matched control population of 71 children. Macrocephaly was noted in 8 learning-disabled children but in only 3 controls, and microcephaly was present in 7 learning-disabled children but in none of the controls. Abnormal head circumferences were noted in 9 learning-disabled males but in only 3 control males. Since this study revealed an increased prevalence of both macrocephaly and microcephaly in children with learning disabilities, future studies of such children should include accurate measurements of head circumference. Abnormal head circumference, when accompanied by other signs, may be used to identify preschool children potentially at risk for learning disabilities.

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