Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are obtained . Low lung volumes somewhat limit evaluation . Likely mild atelectasis or bronchovascular crowding accounts for subtle opacities in the lower lungs . There is no definite sign of pneumonia , CHF , pleural effusion , or pneumothorax . Cardiomediastinal silhouette appears normal . Bony structures are intact . There is no free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process . Subtle opacities in the lower lungs likely atelectasis or bronchovascular crowding . If needed , a repeat study with more optimized inspiratory effort may be performed to confirm .