Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded . Retrosternal soft tissue only seen on lateral projection may represent a right middle lobe pneumonia or scarring . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the osseous structures demonstrates a subacute lateral left ninth rib fracture . Additional chronic healed deformities of the anterolateral left fifth through seventh ribs are noted .
    OUTPUT:
    
1 . Subacute lateral left ninth rib fracture . Recommend detailed view of the rib to assess for underlying pathologic lesion . 2 . Retrosternal soft tissue only seen on lateral projection may represent a right middle lobe pneumonia or scarring . Recommend oblique views to further assess .