Fig. 31

Sequential head circumference measurements in a boy with achondroplasia. Transient acceleration of head growth occurred at around 4–5 years of age (accompanied by non-specific symptoms including occasional emesis). Neuroimaging at that age did demonstrate increased ventricular size compared with imaging completed in the first year of life. There was subsequent equilibration of head growth without intervention. Now an adult, the individual is of normal intelligence and without any indicators of any harmful effects of this transient acceleration and re-equilibration