Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate fully expanded and clear lungs . The cardiomediastinal and hilar contours are unchanged . There is no pleural effusion or pneumothorax . On lateral view , there is a dense lobular structure projecting over the heart which was present in ___ , but is now slightly larger .
    OUTPUT:
    
1 . No acute abnormality . 2 . Dense lobular structure projecting over the heart on lateral view is of unknown etiology , but could represent a paraesophageal hernia . Recommend chest CT for further evaluation .