Skin fold resembling pneumothorax.

Skin folds and pneumothorax can often be confused on chest radiographs. We present the chest X-ray (Fig. 1 A) of a 71-yearold man with cancer who presented due to a deterioration in his general health status, where a skin fold was observed in the left hemithorax. Computed tomography (B) confirmed the absence of pneumothorax. The skin fold (A) appears as an interface (arrowhead) in the lung field, between 2 areas with vasculature (arrow). An antero-posterior projection was used, with the patient in supine decubitus. Positioning the chassis between the X-ray table and the