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Medical risk management has one main purpose: to ensure the safety of care. The law of March 2002 has generated a true cultural revolution. The radiologist is involved with new and difficult areas of medical liability due to technical advances, the increasing number of imaging techniques, the increasing complexity of imaging techniques, their efficiency and the need for multidisciplinary approach. Imaging recommendations requiring increasing levels of technical and clinical skills. The radiologist is liable with regards to the indications of imaging studies, and also with regards to informed consent. The prevention of medicolegal problems is achieved by competency, which must be combined to good liability insurance and ongoing vigilance supported by appropriate continuous medical education.

Cerebral sulci identification process is based on several formal rules: it consists a series of steps allowing the identification of the major sulci. The process may be variable for each of us and we propose to read the images in certain order starting with the frontal lobe and its superior frontal gyrus than precentral and central gyri followed by the lateral fissure. Then the insular, lateral parietal and medial hemispheric regions. Finally the major sulci within the temporal and occipital lobes are described in the frontal plane. This presentation indicates the principal rules of cerebral lobes'identification, the basis of variability perception and the localization of small lesions allowing an accurate correlation with clinical findings and a suitable therapeutic procedure.

Diagnostic criteria of intracranial epidermoid cysts were established from the observation of 15 cases, confirmed by pathology, seen during the last 5 years. Tumors could be divided into four groups: posterior fossa, supratentorial spaces, transtentorial and extradural. Regions of hypodensity associated with the irregular nature of the outlines of the lesion are generally sufficient to suggest the diagnosis in a pre-operative scan, but certain tumors may be isodense or, more exceptionally, spontaneously hyperdense. Contrast images are extremely rare, and are seen only at the periphery of the lesions. The "mass-effect" is remarkably discrete when compared with the tumor size, sometimes of very large proportions.