Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is unchanged from prior study . The cardiomediastinal silhouette and hilar contours are unchanged . As seen on prior examination , there is a suggestion of increased density in the right lower lung without a lateral correlate and this likely represents a summation effect from overlying soft tissues . The lungs are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic process .