Definition of Microcephaly
Microcephaly is a condition in which a person’s head is significantly smaller than normal for their age and sex, based on standardized charts. Head size is measured as the distance around the top of the head.
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. – 11/18/2009