Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild left apical pleural thickening . Normal cardiomediastinal and hilar contours . Normal pleural surfaces . Fully expanded , clear lungs . No pulmonary vascular congestion , acute pneumonia , pleural effusion , or pneumothorax .
    OUTPUT:
    
No acute pneumonia or pulmonary edema to suggest acute on chronic CHF .