Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The heart size is top normal . The aorta is tortuous . Rounded opacity overlying the first costochondral junction on the left is noted , possibly representing bony hypertrophy . There is no focal consolidation . No pleural effusion or pneumothorax is visualized . No acute osseous abnormality is identified . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
No acute traumatic injury identified . Rounded opacity overlying the left first costochondral junction may reflect bony hypertrophy , though an underlying pulmonary opacity / nodule is not excluded . Comparison with prior exams is recommended , or oblique radiographs can be obtained for further evaluation .