Lung abscesses, if large enough, will contain liquefied necrotic material and purulent exudate that often results in an air-fluid level by chest radiograph in the abscess.
Careful dissection of the eyes usually reveals fibrinopurulent exudate in the anterior chambers.
In this case, blood filled the pleural cavity (hemothorax), but atelectasis could also result from filling the chest with air (pneumothorax), transudate (hydrothorax), lymph (chylothorax), or purulent exudate (empyema).