patients < 40 years old." Other subsequent studies have questioned the ISAT's conclusions directly. This conclusion is based on a number of methodological assumptions itself and other authors have cautioned about extending it to other patient populations. It appears that although endovascular coiling is associated with a shorter recovery period as compared to surgical clipping, it is also associated with a significantly higher recurrence rate after treatment. The long-term data for unruptured aneurysms are still being gathered. See also Cerebral aneurysm Subarachnoid hemorrhage References Neurosurgery Radiology