[Thoracic sonography in childhood]

Although limited by osseous structures and gas the sonographic evaluation of the chest may be useful for certain conditions. Illustrated by three cases--supradiaphragmatic and parasternal tumor, subpulmonic effusion, and pleural effusion combined with a mediastinal tumor--the indications for ultrasound studies in children are discussed. In many cases the ultrasound may be helpful considering the diagnostic procedure and therapeutic consequences.