[Diseases of the pleura, thoracic wall and diaphragm].

In the case of lesions of the pleura, the thoracic wall and the diaphragm, chest x‑ray is of great relevance in everyday clinical practice. In many clinical situations, it is already sufficient for the initial diagnosis or for monitoring the course of the disease; these include, for example, pleural effusion and pneumothorax. In some cases, however, supplementary cross-sectional imaging may be necessary, e.g., if there is a possible pleural empyema or if the soft tissues of the mediastinum and pleural wall are also affected. Further diagnostic workup is also necessary for more advanced questions such as staging or surgical planning. This article is intended to provide an overview of the most common diseases of the pleura, thoracic wall, and diaphragm with their typical appearances on radiographs and, at the same time, to demonstrate the importance and limitations of conventional diagnostics.