Comparison of hydrocephalic rat and control. a: Graph of body weights measured weekly in hydrocephalic and control rats. Hydrocephalus was induced in three-week old rats, designated week 1 on graph. After an initial loss of weight, the hydrocephalic rats did not regain the same weight as the controls ( p<0.05). Data are means ± SEM. b: control rat and c: hydrocephalic rat; note the dome-shaped head, hunched back and splayed limbs in the hydrocephalic rat.