Figure 10: (10a) A GRE T2*-weighted sagittal image reveals a complex tear of the posterior horn of the medial meniscus, having horizontal (arrows) and longitudinal (arrowhead) components. Complex tears like this are likely to be unstable.igure 6: (6a) A radial tear of the body of the lateral meniscus also appears vertical on sagittal MR images (arrow), though in the case of radial tears, the lesion is oriented perpendicular to the c-shaped fibers of the meniscus.
In brief: See a doctor, urgent. A collapsed lung (pneumothorax) is due to an air leak from the inside of the lung through the covering of the lung, out into the space between the lung and the ribs. The site of the leak has some damage, which will heal itself later.
Blood may also fill inside the lungs but this usually occurs as a result of severe trauma and the cause is clearly evident, like in a gunshot or stab wound. In most trauma cases where blood can fill into the lungs, the lungs collapse and the blood accumulates around the lungs in the pleural space (hemothorax).