Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate a heterogeneous opacity in the left lower lobe . There is chronic moderate cardiomegaly . The lungs are otherwise clear . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
Left lower lobe opacity could represent pneumonia in the appropriate clinical setting . Followup radiograph after treatment is recommended .