A collapsed lung, or<unk> , is the collection of air in the space around the lungs. This buildup of air puts pressure on the lung, so it cannot expand as much as it normally does when you take a breath.
Pneumothorax
Hemothorax
Chylothorax
Urinothorax
Hydropneumothorax
Hemopneumothorax
Round pneumonia
Hydrothorax