Increased oxygen extraction demonstrated on gradient echo (T2*) imaging in a patient with acute ischaemic stroke.

Conclusion These 2 case reports emphasize the difficulties of the neuro-radiological diagnosis and of the decision-making for the management of hemorrhagic dissection of the ACA. The second patient was surgically treated but, unfortunately, the wrapping of the dissected arterial wall could not prevent the recurrence of the hemorrhage. On the other hand, the follow-up showed that the dissection tends to heal spontaneously with restoration of a normal arterial lumen and that the conservative treatment was effective with a good outcome in both cases. The literature review (table 1) and our own experience seem to suggest that this therapeutic option could be safely proposed for the management of hemorrhagic dissections of the ACA. Spontaneous dissecting aneurysms of anterior and middle cerebral artery associated with brain infarction: a case report and review of the literature. dissecting aneurysm causing subarachnoid hemorrhage: the role of computerized tomographic angiography and magnetic resonance an-giography. A saccular-like dissecting an-eurysm of the anterior cerebral artery that developed 2 years after an ischemic event. Serial angiography and endovascular treatment of dissecting aneu-rysms of the anterior cerebral and vertebral arteries: case report. T: Subarachnoid hemorrhage from intracranial dissecting aneurysms of the anterior circulation: two case reports (in Japanese). Anterior cerebral artery dissecting aneurysm associated with fibromuscular dysplasia (FMD): a case report (in Japanese). haemorrhage due to a dissecting aneurysm of the anterior cerebral artery: a case report. dissection of the anterior cerebral artery presenting subarachnoid hemorrhage and cerebral infarction: a case report (in Japanese). A: Dissecting an-eurysms of the anterior cerebral artery and accessory middle cerebral artery: case report. Ruptured intracranial dissecting aneurysms: management considerations with a focus on surgical and endovascular techniques to preserve arterial continuity. Magnetic resonance (MR) imaging is sensitive to the oxidative state of haemoglobin, as oxy-and deoxyhaemoglobin have different magnetic properties – the blood oxygen level dependent (BOLD) effect. Indeed, functional MR imaging techniques are sufficiently sensitive to the BOLD effect that they can be used to assess cerebrovascular reactivity with a simple breath-holding test or CO 2 challenge [1] .