Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dense retrocardiac opacity projects over the spine in the left lower lobe . The right lung is clear . There is no pleural effusion or pneumothorax . Cardiac size is enlarged but stable . No pulmonary edema .
    OUTPUT:
    
Left lower lobe pneumonia . Recommend follow up to resolution given the history of hemoptysis .