Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate clear lungs bilaterally . The heart is enlarged though similar in size relative to prior study dated ___ . Mediastinal and hilar contours are within normal limits . There is no evidence of pulmonary edema , pneumothorax , or pleural effusion . Visualized osseous structures demonstrates no acute abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality . Chronic mild cardiomegaly .