Q1. Which of the following statements is correct about Subarachnoid hemorrhage (SAH)?
- (1) A normal CT within 24 h of onset of symptoms excludes SAH.
- (2) The most common etiology is trauma.
- (3) Focal interhemispheric blood suggests an anterior communicating artery aneurysm rupture.
- (4) Blood in the 4th ventricles is a typical feature of posterior communicating artery aneurysm rupture.