Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hypoinflated . Multiple rounded opacities are seen throughout the left hemi thorax projecting at the end of ribs and may represent old rib fractures with pleural thickening . Rounded opacity at the right hilum likely represents main pulmonary artery on end . No pleural effusion or pneumothorax . Mildly prominent heart is related to patient positioning and lung volumes . Mediastinal contour and hila are otherwise unremarkable . Limited assessment of the upper abdomen is unremarkable .
    OUTPUT:
    
1 . Multiple rounded opacities projecting over the left mid chest could be rib fractures with pleural thickening . 2 . Round opacity at right hilum likely represents main pulmonary artery on end . 3 . Recommend new frontal film for further clarification .