The radiographical and clinical expression of sarcoidosis is highly variable according to the initial presentation, the organs involved and the course of the disease. An abnormal chest radiography is noticed in 90% cases. The radiographic staging makes possible an estimation of both the length of sarcoidosis and the probability of recovery. Extrathoracic localizations can appear at a variable time in the natural history of sarcoidosis, these are related to a short- or longstanding form of the disease and are influenced by the epidemiological context. An accurate knowledge of the natural history allows enhance the security of diagnosis, to plan the survey and to better interpret clinical events during evolution.