Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well - expanded . Opacity anterior to the spine on the lateral view is of unclear etiology and could be further characterized with oblique views of the chest . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Likely no acute cardiopulmonary process , however recommend oblique chest radiographs to rule out pathology related to the visualized opacity .