Leptomeningeal cyst: early diagnosis by color Doppler imaging.

A newborn with a leptomeningeal cyst over the anterior fontanelle due to birth trauma is described. Color Doppler flow sonograms were helpful to diagnose the leptomeningocele in its early stages and to differentiate it from a cephalhematoma or subgaleal haemorrhage by demonstrating cerebro-fugal flow in an arterial connection between the extracranial fluid collection and the dural space.