Lainhart JE, Piven J, Wzorek M, Landa R, Santangelo SL, Coon H, Folstein SE.
University of Utah, Salt Lake City 84108, USA.
OBJECTIVE: To explore the frequency and onset of macrocephaly in autism and its
relationship to clinical features. METHOD: Head circumferences at birth, during
early childhood, and at the time of examination were studied in a
community-based sample of autistic children and adults. The authors investigated
whether head circumference at the time of examination was associated with
clinical features. RESULTS: Fourteen percent of the autistic subjects had
macrocephaly: 11% of males and 24% of females. In most, the macrocephaly was not
present at birth; in some it became apparent in early and middle childhood as a
result of increased rate of head growth. A small relationship was noted between
head circumference percentile and less severe core features of autism. Neither
macrocephaly nor head circumference percentile was associated with nonverbal IQ,
verbal status, seizure disorder, neurological soft signs or minor physical
anomalies in the autistic subjects. CONCLUSION: Macrocephaly is common in autism
and usually is not present at birth. Rates of head growth may be abnormal in
early and middle childhood in some (37%) children with autism. Macrocephaly does
not define a homogeneous subgroup of autistic individuals according to clinical
features.
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