Chicago White Sox reliever Danny Farquhar continues to fight for his life and has undergone a second surgery according to a report. Sounds like he had a craniotomy for clipping of the aneurysm. Depending on the location, size, and severity of the bleed, this method for securing the aneurysm is occasionally chosen over the endovascular route.
The second procedure was likely placement of an external ventricular drain, or ventriculostomy procedure. This is done for elevated intracranial pressures, and allows neurosurgeons to measure and manage the pressure inside the skull.
The timeline of 3 weeks in the hospital is typical. This is owing to the fact that these patients are at risk for a condition called vasospasm. The initial hemorrhage causes blood to be on the outside of the blood vessels, which causes irritation, and the vessels can spasm closed. This can cause a stroke. Patients are typically watched for two weeks after a subarachnoid hemorrhage, as vasospasm risk peaks in days 3-7, and decreases after day 14.
If vasospasm occurs, the treatment is usually medications, and to put a tiny balloon in the blood vessel and inflate it to open the spasmed vessels.