Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Confluent opacities projecting over the lower thoracic spine on lateral radiograph likely correlate with retrocardiac opacity seen on frontal view . Moderate cardiomegaly is unchanged . Mild pulmonary vascular congestion without overt edema . No pleural abnormality .
    OUTPUT:
    
Findings suggest left lower lobe pneumonia . Recommend follow up radiographs in ___ weeks to assess for resolution .