Clinics in diagnostic imaging (28).

A 44-year-old man presented with sudden headache and neck stiffness. Computed tomography (CT) demonstrated subarachnoid haemorrhage. CT and magnetic resonance (MR) angiography showed the cause to be a ruptured anterior communicating artery aneurysm. These findings were confirmed by digital subtraction angiogram and at surgery. The role of imaging in detection of cerebral aneurysms is briefly discussed.