Most common sequelae due to periventricular leukomalacia –
Spastic diplegia
Spastic quadriplegia
Mental retardation
Seizures
Spastic diplegia is commoner in preten-n babies and is associated with periventricular leukomalacia. Periventricular leukomalacia 
Periventricular leukomalacia is a form of brain injury characterized by the death of white matter near the cerebral ventricles due to damage and softening of brain tissue.
Premature infants are at the greatest risk of developing periventricular leulcomalacia.
Affected individuals develop : -

i)    Motor control problems
ii) Other developmental delay
iii) Cerebral palsy (especially spastic diplegia)
iv) Epilepsy