Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual lead left - sided AICD is stable in position . The cardiac and mediastinal silhouettes are stable . No pleural effusion is seen . Patchy right base opacity is seen , with differential diagnosis being atelectasis versus pneumonia . No pneumothorax is seen . There is no overt pulmonary edema .
    OUTPUT:
    
Patchy right base opacity , atelectasis versus pneumonia . .