Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph is provided . A left central line catheter tip terminates within the right atrium . Compared to the previous exam there is increased radiodensiy in the right lower lung zone and since the left lower lung is difficult to evaluate , it is unclear if this is a unilateral process . The heart remains severely enlarged . Multiple pulmonary nodules are better visualized in the prior CT . There is no pneumothorax or pleural effusion . Severe degenerative changes within the right shoulder are noted .
    OUTPUT:
    
Increased radiodensity in the right lower lung zone which may represent asymmetric pulmonary edema or pneumonia .