Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle retrocardiac basilar opacity seen on the lateral view is felt to most likely be due to overlapping structures , and is not substantiated on the frontal view . No definite focal consolidation is seen . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . No definite focal consolidation .
    OUTPUT:
    
No acute cardiopulmonary process .