Sonography of extraaxial fluid in neurologically normal infants with head circumference greater than or equal to the 95th percentile for age

The goal of this study was to examine sonographically the extraaxial space in neurologically normal infants with occipital frontal circumference great er than or equal to the 95th percentile for age and correlate these dimensi ons with neurologic follow-up findings to determine a range of normal value s. We thus hope to obviate unnecessary workup of these patients, including additional imaging or intervention. Our results demonstrate that for infant s with a craniocortical width or sinocortical width less than 10 mm, the ne gative predictive value and specificity for developing a neurologic abnorma lity during the 55 week follow-up period were 94 to 100% Thus, for neurolog ically normal infants with occipital frontal circumference greater than or equal to the 95th percentile for age and a head ultrasonogram that is other wise normal, a craniocortical or sinocortical width of up to 10 mm can be c onsidered within normal limits. Clinical follow-up evaluation is prudent, b ut additional imaging of these infants is not required.