Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bedside upright AP radiograph of the chest demonstrates a new uniform opacity overlying the middle and lower right lung fields , through which normal bronchopulmonary structures can be seen . A more dense opacity at the left lung base obscures the left hemidiaphragmatic contour , and probably represents atelectasis . Stable , minimal widening of the mediastinum results from mediastinal vascular engorgement . Minimal pulmonary vascular engorgement is also unchanged . The heart size is normal . There is no pneumothorax . An endotracheal tube terminates no less than 4 .4 cm above the carina . The right internal jugular central venous catheter is appropriately positioned and unchanged . An orogastric tube courses into the stomach and out of the field of view .
    OUTPUT:
    
1 . Possible new right pleural effusion . Less likely , this could represent uniform lower lobe collapse . It is suggested that the patient be treated empirically with chest PT . These two possibilities may be differentiated by performing a right lateral decubitus chest radiograph to demonstrate fluid layering , or bedside ultrasound . 2 . Pulmonary and mediastinal vascular engorgement suggesting mild elevation of central venous pressures . 3 . Persistent atelectasis at the left lung base . In the appropriate clinical setting , pneumonia in this location can not be excluded .