[Brain imaging in seizures].

Cerebral imaging studies are performed systematically in children with non-idiopathic epilepsy. Magnetic resonance imaging (MRI) of the brain is the preferred technique. In emergency settings, when immediate neurosurgical treatment may be required (acute haemorrhage, etc.) non-enhanced computed tomography (NECT) is indicated, due to the shorter exam duration and the greater availability. Despite a normal NECT scan, the MRI scan is always indicated for non-idiopathic epileptic patients to search for small cortical sub-cortical abnormalities often overlooked in CT scans. On the other hand, a second intention CT scan to look for calcification may be indicated when tuberous sclerosis, Aicardi-Goutieres syndrome, infectious foetal diseases are suspected. The MRI protocol is adapted to each case based on clinical and EEG findings, but will always include a T1 weighted-3-dimensional (isotropic) acquisition, axial and coronal T2 and T2-Flair weighted images and T2*. Contrast injection is mandatory especially when abnormal findings are seen on the MRI precontrast images.