[Chest ultrasonography].

Chest ultrasonography is a useful tool for assessing disease activity in the peripheral lung parenchyma, pleura, chest wall, diaphragm, and mediastinum. Ultrasound imaging also provides highly useful guidance in invasive diagnostic and therapeutic procedures. The main advantages of this imaging technology are the absence of ionizing radiation and the possibility of real-time bedside applications. The chief indications and limitations of chest ultrasonography and the principal sonographic signs are reviewed.