Subarachnoid haemorrhage from a cerebral aneurysm (aSAH) in pregnancy is uncommon. The incidence is estimated at 5.8 cases per 100,000 births.
The bleeding constitutes a very serious condition for both the mother and the foetus. aSAH is the third most common non-pregnancy cause of maternal mortality during pregnancy and is responsible for severe maternal and foetal morbidity. aSAH mortality is double in untreated patients compared to those who are treated (10.2 vs. 5.2%). Special consideration must be taken for both the mother and the foetus.
Our knowledge is based solely on case reports, as prospective studies are impossible due to both the scarcity of the ailment and ethical objections.