case_images: PMC10851047_01
case_images: Chest computed tomography. The image near the lung apex shows free air in the mediastinum and subcutaneous emphysema in the soft tissues of the back (A). Free air can be seen from the spine to the mediastinum surrounding the bronchi (B).
case_images: cureus-0016-00000051887-i01.jpg
case_images: PMC10851047_01_cureus-0016-00000051887-i01.jpg
case_images: FIG1
case_images: However, a chest CT scan showed free air in the normal-sized mediastinum and subcutaneous emphysema in the soft tissue of the dorsal upper chest, leading to the diagnosis of SPM (Figure 1).