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moderate reduction in the number of sulci of the cerebrum, sometimes with increase in the brain substance, resulting in excessive size of the gyri.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Condition in which the convolutions of the cerebral cortex are abnormally large; there are fewer sulci than normal and in some cases the amount of brain substance is somewhat increased.
[pachy- + G. gyros, circle]
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