Eldery female, fell at home. Left sided chest pain and shortness of breath.
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A perfectly straight line traverses the lower left thoracic cavity due to a combination of fluid and air in the pleural space.
Right lung clear.
Hemo or hydropneumothoraces are due to a combination of blood or other fluid along with air in the pleural space.
Trauma and thoracic intervention are the usual culprits.
Unlike in a pleural effusion with a lateral meniscus, when air and fluid is combined the appearances are perfectly straight in the horizontal plane due to the air-fluid level.