Hydranencephaly could be a cause of fetal seizures, as well as other central nervous system anomalies. Vascular anomalies as cerebral infarction could cause fetal seizures too
Regarding fetal seizures, the relationship with stroke, in particular arterial ischemic one typical of cerebral middle artery, would be very interesting. It is well known that for unknown and protective pathogenic mechanisms, a part of them does not give birth symptoms, while the symptomatic forms can manifest themselves with early-onset seizures.