Fig. 4. Computed tomography aspect suggestive of an intrathoracic and extrapleural chest tube. The intrathoracic but extrapleural position of the chest tube is suspected on an axial computed tomography section showing its route within the left hemithorax ( top figure ). Sagittal reconstructions following planes A to E show the tube within the fourth intercostal space ( image E , gray arrow ), then entering the left hemithorax through a pleural adhesion ( image D , gray arrowhead ), and lying in this pleural adhesion until its distal extremity without reaching the pleural space ( images C and B , black arrows ). This radiologic aspect may traduce (1) an extrapleural malposition, (2) a tube in a tightly loculated pleural space, and (3) a subpleural intraparenchymatous tract, because the two pleural folds are too thin to be visible on computed tomography sections.