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Chest tube displacement.

The direct and indirect radiographic signs of lobar collapse or atelectasis are well described [1 , 2]. Aside from a local increase in lung opacity, the diagnosis of lobar collapse is often suggested by movement or displacement of normal intrathoracic structures such as the fissures, hila, hemidiaphragms, and the mediastinum or trachea. Movement of acquired intrathoracic markers such as granulomas also may reflect lobar collapse [3]. In our case, displacement of an indwelling thoracostomy tube reflected elevation of the hemidiaphragm, and was the main clue to the diagnosis of lobar collapse.