There is a curvilinear well-defined edge projected over the lateral aspect of the left lung paralleling the chest wall. Additionally, there are linear lucencies projected in the soft-tissues at the left and right inferior lateral chest walls. On first inspection, the appearance is very convincing for a left-sided pneumothorax and associated small volume subcutaneous emphysema. However, on close inspection, it is noted that vascular markings do extend beyond what would be the pleural margin (best seen on sharp algorithm) and the would-be pleural margin is not a thin white line but is instead a 1cm thick white line that fades medially and abruptly stops laterally. The appearance is therefore that of a skin fold which is mimicking a pneumothorax, and additional skin folds mimicking subcutaneous emphysema.