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Robert H. A. Haslam, MD, FRCP(C); J. Thomas Dalby, PhD; Robert D. Johns, MD, FRCP(C); Alfred W. Rademaker, PhD

Arch Neurol. 1981;38(11):679-682.

Abstract
• The computed cranial tomograms (CCTs) of 26 dextral boys with developmental dyslexia were examined for asymmetry of width and length in the frontal and occipital regions. Contrary to several previous reports, reading disability was not associated with an increase in the frequency of reversed occipital widths. There were, however, proportionately more symmetric occipital widths than expected in comparison with a control sample and previously established norms. Differences in verbal or performance IQs were not related to relative cerebral size. Language delay was also not associated with brain measurements. The CCT may be increasing in use as a tool in the investigation of children with developmental dyslexia. We conclude that CCT is not warranted unless an underlying disorder associated with significant neurologic signs is discovered by examination.

Author Affiliations
From the Departments of Pediatrics (Dr Haslam), Radiology (Dr Johns), and Community Health Science (Dr Rademaker), University of Calgary Medical School, Alberta; the Departments of Pediatrics (Dr Haslam) and Radiology (Dr Johns), Foothills Hospital, Calgary; and Alberta Children's Hospital (Drs Dalby and Haslam), Calgary.

Footnotes
Accepted for publication March 24, 1981.

Read in part before the Second International Child Neurology Congress, Sydney, Australia, Nov 30, 1979.

Reprint requests to Department of Pediatrics, Foothills Hospital, 1403 29th St NW, Calgary, Alberta, Canada T2N 2T9 (Dr Haslam).

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