Introduction

There are three main classes of non-traumatic SAH. These are:

• Aneurysmal SAH
• Non-aneurysmal SAH
• Vascular rarities such as arterio-venous malformations (AVMs), dissections, tumours and vasculitides

This session looks at aneurysmal and non-aneurysmal SAH.

Vascular rarities will be covered in other sessions.