Imagerie moderne des pneumonies infectieuses aiguës

The acute infectious pneumonia constitute a problem of public health because they are one cause of great morbidity and mortality in adult. If the clinical and radiological information allow often to achieve the diagnosis of infectious pneumonia, the etiologic diagnosis is more difficult. Indeed, numerous pathogen germs are responsible of pneumonia and the reaction of lung is not very various, this explain the low specificity of radiological imaging, except for few characteristic cases. That’s why the understanding of physiopathologic mechanisms allow to explain some special cases. In the same way, the knowledge of anatomical and radiological understanding allow the acknowledgment of three main radiographic appearance. As for the evaluation of epidemiological and immune contexte, they can allow to recognize the concern germ.