Benign subdural hygromas of infancy are a relatively common occurrence associated with prominence of the forehead and rapid head growth in early infancy.
A CAT scan of the skull reveals extra fluid outside the brain, but underneath its covering membran (dura). This extra fluid leads to skull changes. Most of these patients only need follow up, as the head deformity is self-correcting. These children occasionally have developmental delay initially, as the large head slows acquisition of motor skills. The children invariably catch up developmentally between 1 1/2 and 3 years of age.