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[Thoracic ultrasound: the pneumologist's new stethoscope].

We now have access to a large library of publications validating transparietal thoracic echography in various clinical situations. Parietal lesions, including osteolysis, can be detected and biopsied during the thoracic ultrasound (TUS) examination. To evaluate the parietal extension of lung cancers, TUS has proved superior to tomodensitometry. Pleural effusions can be easily diagnosed and aspirated. Pneumothoraces can be detected using well defined lung artifacts with a high frequency probe. Pleural and peripheral lung nodules can be detected and biopsied with real time visualization; the procedure is safe and accurate. Lung consolidations with a pleural contact can be diagnosed; this is particularly useful for pregnant women. In conclusion, TUS is a precious diagnostic tool for chosen applications, and can help to guide interventional procedures. The portable devices are also very useful for bedridden patients or for out of hospital use.