[X-ray computed tomography in a series of aneurysms of the circle of Willis].

During four years, 80 patients with intracranial aneurysms were examined by a CT scanner. The CT was helpful for: The rapid and easy diagnosis of subarachnoid hemorrhage. Direct visualization of intracranial aneurysms. Detecting intracerebral or intraventricular hematoma and distribution of subarachnoid clots. The limitations and pitfalls of CT were: No abnormality was seen on 16 scans (20%). The identification of the source of bleeding in multiple intracranial aneurysms.