Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Normal heart size , mediastinal and hilar contours . Low lung volumes accentuate pulmonary vascular markings . No focal consolidation , pleural effusion or pneumothorax . A triangular density projecting over the left first rib anteriorly is unchanged from ___ and likely related to the first rib costochondral junction . There is a small hiatal hernia .
    OUTPUT:
    
No acute process .