Seizures. There is a porencephalic cyst that measures up to 9 cm associated with considerable tissue deficiency of the right cerebral hemisphere, such portions of the frontal lobe measure less than 1 mm in thickness, but with relative sparing of the temporal lobe, although there is extension of the porencephalic cyst into the temporal horn, where there are two more discrete compartments that measure 1.0 cm and 1.5 cm in diameter. There is absence of at least a portion of the septum pellucidum. The posterior fossa structures and left cerebral hemisphere are relatively intact, with mild deformity in response to the right cerebral hemisphere abnormality. There is no evidence of intracranial hemorrhage, mass, or acute infarct. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
Extensive right cerebral hemisphere volume loss associated with porencephalic cyst formation.