Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette . There is a left lower lobe opacity which could represent atelectasis , but given the clinical history , pneumonia is a serious consideration . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left lower lobe opacity which may represent atelectasis , but given the clinical history , pneumonia is a serious consideration . These findings were communicated via telephone by Dr . ___ to Dr . ___ at ___ on ___ .