Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . Lung volumes are slightly low . The lungs are clear . Bulging of the posterior cardiac border is redemonstrated . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
1 . No acute cardiac or pulmonary process . 2 . Unchanged bulging of the posterior cardiac contour , possibly secondary to a mediastinal or pericardial cyst versus a cardiac abnormality . Further evaluation could be performed with non-emergent CT or echocardiography .