Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hyperinflated but clear . A nodular opacity at the left lung base appears to be within the posterior rib on the lateral projection and is unchanged compared to the prior study . Heart size mediastinal contours are normal . No pleural effusion or pneumothorax . Osseous structures are intact .
    OUTPUT:
    
Mild hyperinflation . No acute cardiopulmonary process seen . .