PVL occurs as a result of damage to the ventricles of the brain and the circulation of the cerebral spinal fluid (CSF). It normally occurs in pregnancy and can lead to cerebral palsy and other conditions so it is not specifically CP or a type of CP. Scope has a really useful information sheet on PVL - http://www.scope.org.uk/support/families/diagnosis/pvl
My daughter has PVL and CP. If you need to talk I'm here.