Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate unexplained opacity and volume loss in the anteromedial basal segment of the left lower lobe , with retraction of the left hemidiaphragm . Heart size is normal . Tortuous aorta . There is no pneumothorax , pleural effusion , or consolidation .
    OUTPUT:
    
Unexplained opacity and volume loss in the anteromedial basal segment of the left lower lobe , with retraction of the left hemidiaphragm . If symptoms continue , recommend CT of the chest for additional evaluation .