<unk> , also known as<unk>  congestion, is liquid accumulation in the tissue and air spaces of the lungs. It leads to impaired gas exchange and may cause respiratory failure. It is due to either failure of the left ventricle of the heart to remove blood adequately from the<unk>  circulation (cardiogenic<unk> , or an injury to the lung tissue or blood vessels of the lung (non-cardiogenic<unk> . Treatment is focused on three aspects: firstly improving respiratory function, secondly, treating the underlying cause, and thirdly avoiding further damage to the lung.<unk> , especially when sudden (acute), can lead to respiratory failure or cardiac arrest due to hypoxia. It is a cardinal feature of congestive heart failure. The term<unk>  is from the Greek (oidēma, "swelling"), from οἰδέω (oidéō, "(I) swell").
Pulmonary edema
Pneumonia
Pleurisy
Emphysema
Hydrothorax
Pleural effusion
Pulmonary infiltrate
Atelectasis