Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . The cardiac silhouette is not enlarged . Mediastinal contours are unremarkable . Query hiatal hernia . There is a oval shaped density projecting over the lower thorax in the midline seen on the frontal view , not substantiated on the lateral view , may be artifactual . Patient 's overlying arm partially obscures the lateral view .
    OUTPUT:
    
The lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . The cardiac silhouette is not enlarged . Mediastinal contours are unremarkable . Query hiatal hernia . There is a oval shaped density projecting over the lower thorax in the midline seen on the frontal view , not substantiated on the lateral view , may be artifactual . Patient 's overlying arm partially obscures the lateral view .