Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . The lungs appear clear bilaterally without focal consolidation , effusion , or pneumothorax . On the lateral view there is a nodular opacity projecting over the mid thoracic spine which given lack of correlate view on the frontal projection may represent an external artifact . The cardiomediastinal silhouette appears normal . No pleural effusion or pneumothorax . No osseous abnormalities are seen .
    OUTPUT:
    
No acute intrathoracic process .