RT Book, Section A1 Ullrich, Nicole J. A2 Rudolph, Colin D. A2 Rudolph, Abraham M. A2 Lister, George E. A2 First, Lewis R. A2 Gershon, Anne A. SR Print(0) ID 7056552 T1 Chapter 550. Macrocephaly and Microcephaly T2 Rudolph's Pediatrics, 22e YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-149723-7 LK accesspediatrics.mhmedical.com/content.aspx?aid=7056552 RD 2024/04/24 AB Normal head growth is affected by the growth and alteration of structures within the cranium (brain, blood, cerebrospinal fluid, and bone) and the timing of these changes in relation to closure of the fontanels. Standards have been determined for head growth in healthy children up to 18 years of age, and the Centers for Disease Control and Prevention has constructed revised standard head circumference for age, based on national survey data from the general US population.1 In addition, special adjusted growth curves have been developed for children with specific underlying medical conditions, such as neurofibromatosis type 1.2