[Good practice of neuroimaging in neurological emergencies].

CT-scan is the preferred investigation in skull trauma and in any patient with suspected meningeal haemorrhage. Any suspicion of compression of the medulla or of a cauda equina requires emergency investigation by MRI. This investigation is also standard when cerebral thrombophlebitis or meningeal encephalitis is suspected. A future increase in available MRI equipment is desirable in order to enlarge the indications of such imaging, particularly in the case of recent cerebral vascular accident.