[Ultrasound morphologic changes in periventricular leukomalacia]. 
Therapeutic advances in neonatology cause fewer hypoxic conditions.  In relation with this we observe fewer high grade brain haemorrhages.  Therefore, ischemical brain changes through brain oedema (12%) and resulting colliquation necroses become the focal point of diagnostic and therapeutic work.  7.3% of intensively treated neonates showed the sonographic picture of a periventricular leucomalacy (PVL).  The polycystic areas can be seen on the eight day after birth at the earliest and at six months they turn into a glia scar which is not very obvious on the sonograph.  We found a relation between beta-mimetic tocolysis, hypocapnia and the development of a PVL.  We were not able to prove statistically a connection with premature birth.