Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . There is a persistent right infrahilar opacity , unchanged from prior study . No pleural effusion , pneumothorax , or pulmonary edema is seen . The heart size is normal . Mediastinal and hilar contours are normal .
    OUTPUT:
    
Unchanged right infrahilar opacity , likely reflective of patchy atelectasis , aspiration pneumonitis , or early consolidation .