Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate low lung volumes . There is no pleural effusion , focal consolidation , pneumothorax . Hilar and mediastinal silhouettes are unremarkable . There is no evidence of pneumomediastinum . Heart size is normal . There is an irregular lucency projecting over left supraclavicular region , which may be external to the patient . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
1 . Clear lungs . No evidence of pneumomediastinum or pneumothorax . 2 . An irregular lucency projecting over left supraclavicular region , may be external to the patient , artifact , or reflect soft tissue abnormality , correlate clinically .