Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates well expanded an clear lungs bilaterally . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion or pneumothorax . Apparent depression of the superior endplate of L2 vertebral body , age indeterminate . Thickened tissue posterior to the lower sternum seen best on the lateral view could be hematoma or edema .
    OUTPUT:
    
1 . Retrosternal increased density without sternal osseous abnormality . This may reflect a focal hematoma . Clinical correlation for cardiac contusion is recommended . 2 . Apparent compression deformity of the superior endplate of L2 should be correlated with clinical findings and evaluated with lumbar spine radiographs .