[Spontaneous hyperdense intracranial vessels seen on CT scan in polycythemia cases].

Purpose: A better understanding of the significance of diffuse hyperdensity affecting the circle of Willis and the dural sinuses on unenhanced CT.

Materials And Methods: We performed a retrospective study of 19 patients with a neurological manifestation and a CT scan without contrast injection. Among these 19 patients, six had been included because of primary or secondary polycythemia.

[Early study of myocardial perfusion with MRI in revascularized infarcts].

The aim of this work is to study the regional myocardial perfusion by MRI early after revascularised myocardial infarction and to compare it with regional function. This prospective work has included 15 patients with acute first myocardial infarction that was precociously revascularised. A myocardial MRI was performed between D2 and D10 after myocardial infarction.

[Aortic dissection].

Most often revealed thanks to chest pain, acute aortic dissection must be suspected and diagnosed without losing anytime, because of their evolutive risks and their specific treatment in a specialised unit. Once the early management is over, survivers must be closely followed, specially for their blood pressure to be kept normal, and to screen for secondary complications that would require surgery. Owing to the improvement of early management and follow up, facilitated by the new non-invasive imaging techniques of the aorta, the severe prognosis of this disease has significantly improved.